Administrators can go to Complex->Settings and check the box for “Enable document upload for new Joinees” setting.
Once checked, any new member requesting to join the portal will be forced to attach/upload any document such as proof of ownership/residence. This document will automatically be emailed to the administrator and also will be present in the list of documents against the residential unit to which member applied to join. Administrators can approve or reject the membership based on the document attached. Administrators can even provide specific joining instructions in the Complex->Settings view so that members know what sort of documents can be uploaded as a proof.