KlugGallery

<extensions>
    <extensionID>com.klug.gallery</extensionID>
</extensions>

<key>NSPhotoLibraryAddUsageDescription</key>
<string>Saves your snapshots and videos to Photos.</string>

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
                 android:maxSdkVersion="28"/>
<application>
    <activity android:name="com.klug.gallery.KlugGalleryPermissionActivity" android:exported="false"
              android:theme="@android:style/Theme.Translucent.NoTitleBar"/>
</application>

import com.klug.gallery.Gallery;
import com.klug.gallery.GalleryEvent;
import flash.display.BitmapData;

var gallery:Gallery = Gallery.getInstance();
gallery.addEventListener( GalleryEvent.ADD_COMPLETE, function( e:GalleryEvent ):void {
    showToast( "Saved to your gallery" );   // your app function
});
gallery.addEventListener( GalleryEvent.ADD_ERROR, function( e:GalleryEvent ):void {
    trace( "could not save: " + e.status );   // the error message
});

function saveSnapshot( picture:BitmapData ):void
{
    if ( !gallery.isSupported ) return;
    // "png" or "jpg"; quality 0..1 counts for jpg
    gallery.addBitmapData( picture, "jpg", 0.9, "snapshot.jpg" );
}

import flash.filesystem.File;

gallery.addEventListener( GalleryEvent.ADD_FILE_COMPLETE, function( e:GalleryEvent ):void {
    showToast( "Video saved" );
});
gallery.addEventListener( GalleryEvent.ADD_FILE_ERROR, function( e:GalleryEvent ):void {
    trace( "could not save the video: " + e.status );
});

// a File or a native path; mp4, mov and m4v are saved as videos, everything else as a photo
var clip:File = File.applicationStorageDirectory.resolvePath( "clips/last.mp4" );
gallery.addFile( clip );

var pending:BitmapData;

function save( picture:BitmapData ):void
{
    var status:String = gallery.authorisationStatus();
    if ( status == Gallery.AUTHORISED || status == Gallery.LIMITED )
        gallery.addBitmapData( picture, "png" );
    else if ( status == Gallery.DENIED || status == Gallery.RESTRICTED )
        askToOpenSettings();                 // your dialog, then gallery.openDeviceSettings()
    else
    {
        pending = picture;                   // not asked yet: show the system prompt
        gallery.requestAuthorisation();
    }
}

gallery.addEventListener( GalleryEvent.AUTHORISATION, function( e:GalleryEvent ):void {
    if ( e.status == Gallery.AUTHORISED && pending != null )
        gallery.addBitmapData( pending, "png" );
    pending = null;
});