remove allowBackup="false"

android/src/main/AndroidManifest.xml

 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
           package="com.iou90.autoheightwebview">
 
-    <application android:allowBackup="false"
-                 android:label="@string/app_name"
+    <application android:label="@string/app_name"
                  android:supportsRtl="true"
     >