First, a reality check. As of this writing, RobTop is still actively patching and supporting Update 2.2 (versions 2.21, 2.22, etc.). The developer has discussed future plans, but no official changelog or release date for 2.3 exists.
Cloud saving with the official servers, access to the official weekly demon levels, or the ability to rate levels. Geometry Dash 2.3 Apk
A native sharing feature allowing users to save levels as external files is confirmed. First, a reality check