Resubmit my Application, Don't know the reason of being rejected.

Hi! I have 2 Questions

1) I want to know the reason that why my application for a Freelancer as a Graphics Designer was Rejected. Please tell me what are the reasons I will make changes and want to submit again. (also don't see any option where to resubmit my application)

2) There was a section that said that to Submit a document that gives proof of your skills. I don't remember what I Submitted there but I have a Document Prove of earing as a Graphics Designer on another platform will that help there? If yes Then how do I change that?

I truly appreciate your help.

Regards,

Muhammad Ali Khan