I am also experiencing the same issue in one of my recently published app.
I have published an app in Google play store, wherein there are features for users to upload their profile picture/logo. But, i am experiencing an error for this function - permission denied. Also, this issue is present only on certain devices. The same function works in some devices, but i have experienced this issue in my android phone.
I guess this is a different issue than the original one: the first question was reg. PWA app.
For your case I can’t really help, unfortunately. I’ve seen some recent posts on forum with the same problem, but I can’t recall if it was solved or not. I would recommend submitting a ticket here Submit a Support Ticket, so that Adalo Dev team can look at the issue.