Yup, Same question why can't I open in Notion.
And why can'y I transmit ANYTHING ANYWHERE. Or for that matter, move a file out of Notion Mobile as a MIDI...file. Can't do it!!! Sucks! And cross your fingers when they'll get around to answering your questions. They always seem to be off doing something els, half baked!. Geez, So many issues with this app/developer, you read the same thing all over the place. So after 10 years of waiting, I done!! I am putting all my energy into Dorico bc they have regular updates and ALWAYS Get back to your question with in a couple days MAX!!