MAKE SURE YOU ARE USING THE LATEST VERSION
Android - 3.1.16, iOS - 3.1.13, Windows App - 3.1.16, FL Plugin - 3.1.12
Version 3.1.16: We are still working on the Export Hub. Internal save locations should work. External locations to FL Studio Mobile may not.
SHARING was updated with version 3.1.12. For SHARE to work, you must update ALL devices to 3.1.12 or later, Get the FL Studio plugin update here