diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 877c1f9..066e32e 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -64,11 +64,10 @@
                 <action android:name="android.intent.action.SEND" />
                 <category android:name="android.intent.category.DEFAULT" />
                 <data android:mimeType="image/*" />
-            </intent-filter>
-            <intent-filter>
-                <action android:name="android.intent.action.SEND" />
-                <category android:name="android.intent.category.DEFAULT" />
-                <data android:mimeType="text/plain" />
+                <data android:mimeType="text/*" />
+                <data android:mimeType="audio/*" />
+                <data android:mimeType="video/*" />
+                <data android:mimeType="application/*" />
             </intent-filter>
         </activity>
 
diff --git a/app/src/main/java/io/heckel/ntfy/msg/ApiService.kt b/app/src/main/java/io/heckel/ntfy/msg/ApiService.kt
index 2b20aac..89ce1b8 100644
--- a/app/src/main/java/io/heckel/ntfy/msg/ApiService.kt
+++ b/app/src/main/java/io/heckel/ntfy/msg/ApiService.kt
@@ -1,5 +1,6 @@
 package io.heckel.ntfy.msg
 
+import android.net.Uri
 import android.os.Build
 import io.heckel.ntfy.BuildConfig
 import io.heckel.ntfy.db.Notification
@@ -28,12 +29,11 @@ class ApiService {
         .build()
     private val parser = NotificationParser()
 
-    fun publish(baseUrl: String, topic: String, user: User?, message: String, title: String, priority: Int, tags: List<String>, delay: String) {
+    fun publish(baseUrl: String, topic: String, user: User?, message: String, title: String, priority: Int, tags: List<String>, delay: String, body: RequestBody? = null) {
         val url = topicUrl(baseUrl, topic)
         Log.d(TAG, "Publishing to $url")
 
         val builder = requestBuilder(url, user)
-            .put(message.toRequestBody())
         if (priority in 1..5) {
             builder.addHeader("X-Priority", priority.toString())
         }
@@ -46,6 +46,13 @@ class ApiService {
         if (delay.isNotEmpty()) {
             builder.addHeader("X-Delay", delay)
         }
+        if (body != null) {
+            builder
+                .addHeader("X-Message", message)
+                .put(body)
+        } else {
+            builder.put(message.toRequestBody())
+        }
         client.newCall(builder.build()).execute().use { response ->
             if (response.code == 401 || response.code == 403) {
                 throw UnauthorizedException(user)
diff --git a/app/src/main/java/io/heckel/ntfy/ui/AddFragment.kt b/app/src/main/java/io/heckel/ntfy/ui/AddFragment.kt
index 06675c9..f32c0d2 100644
--- a/app/src/main/java/io/heckel/ntfy/ui/AddFragment.kt
+++ b/app/src/main/java/io/heckel/ntfy/ui/AddFragment.kt
@@ -193,7 +193,7 @@ class AddFragment : DialogFragment() {
         subscribeInstantDeliveryBox.visibility = if (BuildConfig.FIREBASE_AVAILABLE) View.VISIBLE else View.GONE
 
         // Username/password validation on type
-        val textWatcher = object : TextWatcher {
+        val loginTextWatcher = object : TextWatcher {
             override fun afterTextChanged(s: Editable?) {
                 validateInputLoginView()
             }
@@ -204,8 +204,8 @@ class AddFragment : DialogFragment() {
                 // Nothing
             }
         }
-        loginUsernameText.addTextChangedListener(textWatcher)
-        loginPasswordText.addTextChangedListener(textWatcher)
+        loginUsernameText.addTextChangedListener(loginTextWatcher)
+        loginPasswordText.addTextChangedListener(loginTextWatcher)
 
         // Build dialog
         val dialog = AlertDialog.Builder(activity)
@@ -219,7 +219,7 @@ class AddFragment : DialogFragment() {
             .create()
 
         // Show keyboard when the dialog is shown (see https://stackoverflow.com/a/19573049/1440785)
-        dialog.window?.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
+        dialog.window?.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE)
 
         // Add logic to disable "Subscribe" button on invalid input
         dialog.setOnShowListener {
@@ -232,7 +232,7 @@ class AddFragment : DialogFragment() {
             negativeButton.setOnClickListener {
                 negativeButtonClick()
             }
-            val textWatcher = object : TextWatcher {
+            val subscribeTextWatcher = object : TextWatcher {
                 override fun afterTextChanged(s: Editable?) {
                     validateInputSubscribeView()
                 }
@@ -243,8 +243,8 @@ class AddFragment : DialogFragment() {
                     // Nothing
                 }
             }
-            subscribeTopicText.addTextChangedListener(textWatcher)
-            subscribeBaseUrlText.addTextChangedListener(textWatcher)
+            subscribeTopicText.addTextChangedListener(subscribeTextWatcher)
+            subscribeBaseUrlText.addTextChangedListener(subscribeTextWatcher)
             subscribeInstantDeliveryCheckbox.setOnCheckedChangeListener { _, isChecked ->
                 if (isChecked) subscribeInstantDeliveryDescription.visibility = View.VISIBLE
                 else subscribeInstantDeliveryDescription.visibility = View.GONE
@@ -303,7 +303,7 @@ class AddFragment : DialogFragment() {
                         Log.w(TAG, "Access not allowed to topic ${topicUrl(baseUrl, topic)}, showing login dialog")
                         val activity = activity ?: return@launch // We may have pressed "Cancel"
                         activity.runOnUiThread {
-                            showLoginView(activity, baseUrl)
+                            showLoginView(activity)
                         }
                     }
                 }
@@ -444,7 +444,7 @@ class AddFragment : DialogFragment() {
         }
     }
 
-    private fun showLoginView(activity: Activity, baseUrl: String) {
+    private fun showLoginView(activity: Activity) {
         resetLoginView()
         loginProgress.visibility = View.INVISIBLE
         positiveButton.text = getString(R.string.add_dialog_button_login)
diff --git a/app/src/main/java/io/heckel/ntfy/ui/ShareActivity.kt b/app/src/main/java/io/heckel/ntfy/ui/ShareActivity.kt
index 9a4fcb1..b66a5e0 100644
--- a/app/src/main/java/io/heckel/ntfy/ui/ShareActivity.kt
+++ b/app/src/main/java/io/heckel/ntfy/ui/ShareActivity.kt
@@ -14,15 +14,23 @@ import android.widget.ImageView
 import android.widget.ProgressBar
 import android.widget.TextView
 import androidx.appcompat.app.AppCompatActivity
+import androidx.lifecycle.lifecycleScope
 import io.heckel.ntfy.R
 import io.heckel.ntfy.app.Application
 import io.heckel.ntfy.msg.ApiService
+import io.heckel.ntfy.util.ContentUriRequestBody
 import io.heckel.ntfy.util.Log
+import io.heckel.ntfy.util.supportedImage
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
 
 class ShareActivity : AppCompatActivity() {
     private val repository by lazy { (application as Application).repository }
     private val api = ApiService()
 
+    // File to share
+    private var fileUri: Uri? = null
+
     // UI elements
     private lateinit var menu: Menu
     private lateinit var sendItem: MenuItem
@@ -30,6 +38,8 @@ class ShareActivity : AppCompatActivity() {
     private lateinit var contentText: TextView
     private lateinit var topicText: TextView
     private lateinit var progress: ProgressBar
+    private lateinit var errorText: TextView
+    private lateinit var errorImage: ImageView
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -50,6 +60,10 @@ class ShareActivity : AppCompatActivity() {
         topicText = findViewById(R.id.share_topic_text)
         progress = findViewById(R.id.share_progress)
         progress.visibility = View.GONE
+        errorText = findViewById(R.id.share_error_text)
+        errorText.visibility = View.GONE
+        errorImage = findViewById(R.id.share_error_image)
+        errorImage.visibility = View.GONE
 
         val textWatcher = object : TextWatcher {
             override fun afterTextChanged(s: Editable?) {
@@ -62,6 +76,7 @@ class ShareActivity : AppCompatActivity() {
                 // Nothing
             }
         }
+        contentText.addTextChangedListener(textWatcher)
         topicText.addTextChangedListener(textWatcher)
 
         // Incoming intent
@@ -69,8 +84,10 @@ class ShareActivity : AppCompatActivity() {
         if (intent.action != Intent.ACTION_SEND) return
         if ("text/plain" == intent.type) {
             handleSendText(intent)
-        } else if (intent.type?.startsWith("image/") == true) {
+        } else if (supportedImage(intent.type)) {
             handleSendImage(intent)
+        } else {
+            handleSendFile(intent)
         }
     }
 
@@ -82,19 +99,26 @@ class ShareActivity : AppCompatActivity() {
     }
 
     private fun handleSendImage(intent: Intent) {
-        val uri = intent.getParcelableExtra<Parcelable>(Intent.EXTRA_STREAM) as? Uri ?: return
+        fileUri = intent.getParcelableExtra<Parcelable>(Intent.EXTRA_STREAM) as? Uri ?: return
         try {
             val resolver = applicationContext.contentResolver
-            val bitmapStream = resolver.openInputStream(uri)
+            val bitmapStream = resolver.openInputStream(fileUri!!)
             val bitmap = BitmapFactory.decodeStream(bitmapStream)
             contentImage.setImageBitmap(bitmap)
             contentImage.visibility = View.VISIBLE
             contentText.text = getString(R.string.share_content_image_text)
         } catch (_: Exception) {
+            fileUri = null
+            contentImage.visibility = View.GONE
             contentText.text = getString(R.string.share_content_image_error)
         }
     }
 
+    private fun handleSendFile(intent: Intent) {
+        fileUri = intent.getParcelableExtra<Parcelable>(Intent.EXTRA_STREAM) as? Uri ?: return
+        contentText.text = getString(R.string.share_content_file_text)
+    }
+
     override fun onSupportNavigateUp(): Boolean {
         finish()
         return true
@@ -119,7 +143,42 @@ class ShareActivity : AppCompatActivity() {
     }
 
     private fun onShareClick() {
-
+        val baseUrl = "https://ntfy.sh" // FIXME
+        val topic = topicText.text.toString()
+        val message = contentText.text.toString()
+        progress.visibility = View.VISIBLE
+        lifecycleScope.launch(Dispatchers.IO) {
+            val user = repository.getUser(baseUrl)
+            try {
+                val body = if (fileUri != null) {
+                    val resolver = applicationContext.contentResolver
+                    ContentUriRequestBody(resolver, fileUri!!)
+                } else {
+                    null
+                }
+                api.publish(
+                    baseUrl = baseUrl,
+                    topic = topic,
+                    user = user,
+                    message = message,
+                    title = "",
+                    priority = 3,
+                    tags = emptyList(),
+                    delay = "",
+                    body = body // May be null
+                )
+                runOnUiThread {
+                    finish()
+                }
+            } catch (e: Exception) {
+                runOnUiThread {
+                    progress.visibility = View.GONE
+                    errorText.text = e.message
+                    errorImage.visibility = View.VISIBLE
+                    errorText.visibility = View.VISIBLE
+                }
+            }
+        }
     }
 
     private fun validateInput() {
diff --git a/app/src/main/java/io/heckel/ntfy/util/Util.kt b/app/src/main/java/io/heckel/ntfy/util/Util.kt
index 4220041..5b87904 100644
--- a/app/src/main/java/io/heckel/ntfy/util/Util.kt
+++ b/app/src/main/java/io/heckel/ntfy/util/Util.kt
@@ -2,6 +2,7 @@ package io.heckel.ntfy.util
 
 import android.animation.ArgbEvaluator
 import android.animation.ValueAnimator
+import android.content.ContentResolver
 import android.content.Context
 import android.content.res.Configuration
 import android.content.res.Configuration.UI_MODE_NIGHT_YES
@@ -14,6 +15,12 @@ import androidx.appcompat.app.AppCompatDelegate
 import io.heckel.ntfy.db.Notification
 import io.heckel.ntfy.db.Repository
 import io.heckel.ntfy.db.Subscription
+import okhttp3.MediaType
+import okhttp3.MediaType.Companion.toMediaTypeOrNull
+import okhttp3.RequestBody
+import okio.BufferedSink
+import okio.source
+import java.io.IOException
 import java.security.SecureRandom
 import java.text.DateFormat
 import java.text.StringCharacterIterator
@@ -218,3 +225,22 @@ fun isDarkThemeOn(context: Context): Boolean {
     }
     return false
 }
+
+// https://cketti.de/2020/05/23/content-uris-and-okhttp/
+class ContentUriRequestBody(
+    private val contentResolver: ContentResolver,
+    private val contentUri: Uri
+) : RequestBody() {
+
+    override fun contentType(): MediaType? {
+        val contentType = contentResolver.getType(contentUri)
+        return contentType?.toMediaTypeOrNull()
+    }
+
+    override fun writeTo(sink: BufferedSink) {
+        val inputStream = contentResolver.openInputStream(contentUri) ?: throw IOException("Couldn't open content URI for reading")
+        inputStream.source().use { source ->
+            sink.writeAll(source)
+        }
+    }
+}
diff --git a/app/src/main/res/layout/activity_share.xml b/app/src/main/res/layout/activity_share.xml
index be596ce..c50190f 100644
--- a/app/src/main/res/layout/activity_share.xml
+++ b/app/src/main/res/layout/activity_share.xml
@@ -31,7 +31,7 @@
             android:scaleType="fitStart"
             android:adjustViewBounds="true" android:maxHeight="150dp"
             app:shapeAppearanceOverlay="@style/roundedCornersImageView" android:visibility="visible"
-            app:layout_constraintTop_toBottomOf="@id/share_content_title" android:layout_marginTop="5dp" android:layout_marginStart="5dp"/>
+            app:layout_constraintTop_toBottomOf="@id/share_content_title" android:layout_marginStart="3dp"/>
     <com.google.android.material.textfield.TextInputEditText
             android:id="@+id/share_content_text"
             android:layout_width="match_parent"
@@ -58,5 +58,21 @@
             android:maxLines="1" android:inputType="text" android:maxLength="64"
             app:layout_constraintStart_toStartOf="parent" app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintTop_toBottomOf="@id/share_topic_title"/>
+    <TextView
+            android:text="Unable to resolve host example.com"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content" android:id="@+id/share_error_text"
+            android:paddingStart="4dp"
+            app:layout_constraintEnd_toEndOf="parent"
+            android:paddingEnd="4dp"
+            android:textAppearance="@style/DangerText"
+            app:layout_constraintStart_toEndOf="@id/share_error_image"
+            android:layout_marginTop="5dp" app:layout_constraintTop_toBottomOf="@+id/share_topic_text"/>
+    <ImageView
+            android:layout_width="20dp"
+            android:layout_height="20dp" app:srcCompat="@drawable/ic_error_red_24dp"
+            android:id="@+id/share_error_image"
+            android:visibility="visible"
+            app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="@+id/share_error_text" android:layout_marginTop="2dp"/>
 
 </androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 28fa3d7..38ebed8 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -190,8 +190,9 @@
     <string name="share_menu_send">Share</string>
     <string name="share_content_title">Message preview</string>
     <string name="share_content_text_hint">Add the content you\'d like to share here</string>
-    <string name="share_content_image_text">An image was shared with you.</string>
+    <string name="share_content_image_text">An image was shared with you</string>
     <string name="share_content_image_error">Cannot read image</string>
+    <string name="share_content_file_text">An file was shared with you</string>
 
     <!-- Notification dialog -->
     <string name="notification_dialog_title">Pause notifications</string>