File transfer in secure transport

Closes #365

AndroidManifest.xml

@@ -74,6 +74,7 @@
             <data android:mimeType="image/*" />
             <data android:mimeType="text/plain" />
             <data android:mimeType="video/*" />
+            <data android:mimeType="*/*" />
         </intent-filter>
 
     </activity>