Proof of address: they require PDFs. Ok. I uploaded a pdf from my local bank and got an error "we accept only pdf, jpg..." and others. Uploaded pdf from international bank - declined because "it's not a bank".
I took a screenshot of a local bank statement, and it declined "we do not accept screenshots".
But at least they answered and sent e-mails. It would be better if they would accept documents without voodoo magic or these strange things.