Unable to import to iOS App

One of the main things I love about the MuseScore iOS App is that I can import any .mscz files I created on the desktop version of MuseScore. As I love this feature so much, I have typed up pretty much every sheet music book I've got & have access to my entire sheet music library digitally via MuseScore.

After a recent update I'm no longer able to import anything into the iOS MuseScore App. After one update it removed my entire library I had imported, so I imported a load again. Now I find I can't import anything anymore. This is the same on my iPad as well as my iPhone.

To import, on the Desktop version of MuseScore I type up the music I want & save it into a cloud based location (iCloud Drive) as a .mscz file. I then go to that location on my iPad, tap on the share button & select Copy to MuseScore.
If I do this now, the MuseScore App will flash open, but nothing will happen. When I do this the file should be accessible via Library > SongBook.

Am I doing something wrong or is this a bug? There have been a few more minor updates since, but the issues persists.

If you'd like anymore information regarding this, please let me know.

Thanks,
Adam