Dear Student ,

It totally depends on the rules and regulations that needs to be followed during filling an online admission form. As my suggestion, you need to upload the proper details. Here you have told that the form requests to upload the provisional certificate which means a temporary certificate from your college authority that shows your completion of graduation .

Your form may rejected at the time of physical verification of documents in IGNOU . But .. within that duration , if you get your graduation certificate, then you can request  the IGNOU authority to accept your admission by telling your issues at the time of filling admission form briefly !

Hope my answer helps !