Don't hesitate just use another browser, problem resolved
1. PANOS 10.2
4. Trying to upload certificate
5. Panicking when migration
6.Engineer ego suspect bug issue
Is a sad TAC case and wasted my company case token is due to silly browser issue.
Yes, you cant find any solution on public KB about this error, according to TAC is from their internal KB.
And, I tried to reproduce next day but miracle happen it success upload.
So conclude, just switch to another browser or using ultimate weapon RESTART YOUR PC.