Mainstage cannot open crashed concert file
I have been working for several days on a complicated Mainstage concert. Mainstage crashed a few hours ago and I have not been able to open the concert again. I can open other concerts. I have even gone into Time Machine to get several versions of the corrupted concert, without any success. I have trashed the Pref file and restarted. What are my options? This concert layout has taken me weeks to create. Please help.
iPad Pro, iPadOS 16