932 excludes .zim files from backup part two adding core file somehow the core manifest file didn't go in, so trying again.

core/src/main/AndroidManifest.xml

@@ -18,13 +18,14 @@
 
   <application
     android:allowBackup="true"
+    android:fullBackupContent="@xml/backup_rules"
     android:hardwareAccelerated="true"
     android:icon="@mipmap/kiwix_icon"
     android:label="@string/app_name"
-    android:usesCleartextTraffic="true"
     android:roundIcon="@mipmap/kiwix_icon_round"
     android:supportsRtl="true"
     android:theme="@style/AppTheme"
+    android:usesCleartextTraffic="true"
     tools:targetApi="m">
 
     <activity
@@ -51,7 +52,7 @@
     <provider
       android:name=".reader.ZimContentProvider"
       android:authorities="${applicationId}.zim.base"
-      android:exported="true" />
+      android:exported="false" />
 
     <receiver android:name=".main.KiwixSearchWidget">
       <intent-filter>