This question already has an answer here:
I just tried to edit a question (retag and new title) on Movies & TV via the SE Android app.
When I clicked on „Preview“ or „Submit“, I got the pop-up message
Not allowed to suggest edits
This was reproducible with another question.
Interestingly enough, clicking the submit button a second time worked and my edit was accepted.
Needless to say, I have edit privileges. So I should be able to not only suggest edits, but edit instantly.