save, work in progress!

android/app/capacitor.build.gradle

@@ -25,6 +25,7 @@ dependencies {
     implementation project(':capacitor-storage')
     implementation project(':capacitor-voice-recorder')
     implementation "com.soundcloud.android:android-crop:1.0.0@aar"
+    implementation "com.android.support:support-v4:27.+"
     implementation "com.squareup.okhttp:okhttp-urlconnection:2+"
 }
 apply from: "../../node_modules/com-sarriaroman-photoviewer/src/android/photoviewer.gradle"

android/app/src/main/res/xml/config.xml

@@ -10,6 +10,10 @@
     <param name="android-package" value="me.rahul.plugins.sqlDB.sqlDB"/>
   </feature>
 
+  <feature name="FileOpener2">
+    <param name="android-package" value="io.github.pwlin.cordova.plugins.fileopener2.FileOpener2"/>
+  </feature>
+
   <feature name="FilePath">
     <param name="android-package" value="com.hiddentao.cordova.filepath.FilePath"/>
     <param name="onload" value="true"/>