I used the "Brave" browser, but I think the problem is in the document you're uploading, not the browser, at least it was for me. First I was uploading an ID document, two times, but the document needed to be not more than 12 months older I think, something like that. Then I uploaded a bank document(which wasn't 12 months older). Two times there was also a site error and wasn't accepting it, but after a few tries, PayPal accepted. I suggest you contact the PayPal team through live chat, they will help you solve this problem faster. I wish you good luck.
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