Recently we have a new Android app and new firmware for both AC and RC for the Spark. But are there any new features implemented with these new versions, or known issues solved? The only I have read about is the official support of OTG for Android, but that one was already working fine for my S8. Release notes mention nothing meaningfull.

Hi, thanks for reaching DJI Forum. We do appreciate bringing this query to us. The only feature that is new is the optimization of the OTG connection which is supported to Android device only.  If you had it working before on your S8 it will be more optimized as before. Thank you.