Hi Mark,
Please refer the below similar communication, maybe it's useful,
https://community.mendix.com/link/space/app-development/questions/129621
https://community.mendix.com/link/space/studio-pro/questions/112722
Hope it helps!
Thanks & Regards,
Manikandan K
Hi Mark,
If you want to use an app package, there are two ways to do it.
In the first scenario you can create a teamserver project directly, where with the second one you will need to upload to the teamserver afterwards (if required).
What they do have in common is that they require an empty folder to extract/create the application structure. Importing an app package in an existing structure does not work.