Big batch update: the tracker is mostly usable

app/src/main/AndroidManifest.xml

@@ -51,6 +51,18 @@
                 android:resource="@xml/usb_device_filter" />
         </activity>
 
+        <!-- Exposes saved preset files (and zip bundles) as content:// URIs so they
+             can be shared to other apps via the system share sheet. -->
+        <provider
+            android:name="androidx.core.content.FileProvider"
+            android:authorities="${applicationId}.fileprovider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/file_paths" />
+        </provider>
+
         <!-- Foreground service that owns the audio engine so playback survives
              when the UI is not visible, and drives the media notification. -->
         <service