Hello,
a new experience:
after having done some work on a project (located in an iCloud folder) I wanted to export (Share) the project back to its original location. But got this error message:
I couldn’t close the project either, so I had to force quit Dorico.
Then in the Files App checked the project file (it still had the old date before my editing).
I went to have a look at the On my iPad->Dorico folder: I discovered a new duplicate of my project with the addition [Autosave] and the date of the application stall.
So I was lucky to be able to recover my work.
Thank you, if this has been a newly introduced feature in Version 6.2.0.6074.
[edit] just for reference: when this happened in earlier versions of the iPad version, I had a private escape route: Share as .pdf and Share as music.xml would still work - so the loss wasn’t hurtful.