I have an app that allows me to export (and import) its contents.
While working to replace the deprecated ‘unarchiveTopLevelObjectWithData’ unarchiveTopLevelObjectWithData (still ongoing) I ran into some issues testing.
My test was that I had previously exported to the Files app and from there using the share sheet I sent it to my app. This was not working.
In the past I had imported files from an app like WhatsApp and that worked fine.