Docs verification

[oasis.gc1]

Hi,

I have recently submitted application to extend my study permit.

Is there a way I can check if all documents that they want are submitted?

Last time, I missed attacking a doc, and they rejected my app rather than raising requirement of this doc. I had also mentioned in my cover letter that I am attaching this doc, but missed attaching it and they told me that I should submit new app

Thanks