If you couldn't receive your PCC before the dead line of submitting your PR application, the only thing you do is to wait till the last day, submit all the docs except the PCC. Provide as much as info you have to support your claim that you applied for your PCC and not received it yet. Upload all the supporting docs into the PCC placeholder. And also write a LOE explaining everything to the VO and ask him for additional time to submit your PCC.
But, this is a wild try. The VO decides how to proceed further with a your case.