In supplier registration, unable to customize the file upload as required/mandatory

Summary:

As part of the requirement, we would like to enable the field under "Attach tax, insurance, and other relevant documents" section holding the file upload option as mandator/required. Tried through Visual Builder Studio but unable to find any option related to this field/component.

Could some one suggest the steps to be followed to make the file upload as mandatory/required.

Navigation : Procurement --> Purchase Requisition (NEW) --> ellipses (…) click on "Request for new supplier" --> scroll to the bottom under "Company Details" tab --> Below to the section "Attach tax, insurance, and other relevant documents" file upload field should be made mandatory/required