I have a vendor request process that users upload documents to based on a document type and then the form is submitted for review and approval.

What I want to do is make sure the user attaches the main form before the request is submitted or it should remain in Draft until the mandatory files document type has been uploaded to the form.

Ex. In order to initiate a Vendor Request, they must upload the Vendor Request Form at a minimum and they can also attach the W9 and certificates of insurance, but they must have the request form before they can submit the request.

Is there a Forms process to handle this or will I need to write custom code?