Mealie fails to import backup

I had problems updating the old mealie app. So I made a backup and exported the data from the old version (App version 3.11.0, version 1.7.2). I installed the new app (App version 3.13.1, version 1.8.6) and tried to import the zipped back up I’d previously made. All I get is a message saying it failed, no explanations no logs that I can find. What do I need to do to get the new version to accept the backup?