@Ken22864056726f Thanks for reaching out to Adobe for your issue. I tried the below steps on latest MAC app store build and not able to reporduce. The steps I followed was as follows:-
1. Install App store 2022 PSE build.
2. Go to Open and navigate to location of PDF document.
3. Check in upload window thumbnail is visible of document.
4. Click Open.
In my case document opened successfully. I would request you to please provide me the screen recording of the issue and also share the machine details and testdata(if possible) to debug. Thanks!