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This is included in next update to the Android app, available in a few days. NOTE: this only works on devices running Android 6.0 (Marshmallow) or later.

This is included in next update, available in a few days.

This is included in next update, available in a few days.

Can you give us more information about this issue to help us investigate? Is there any pattern to when your lose your downloads? Is it linked to any other activity, such as updating the app? Is your iPhone's memory nearly full?