Adding new docs in a proposal

Hi! At publishing a new proposal, we only are able to add a doc at the very beginning, at the moment of creating it. Usually we work in this proposal and we end the process with a second version of the original document. In order to enhance this process, it would be useful to have the option of adding other documents in a list of versions/documents inside the original proposal. Do u know what i mean? (I write in English to account the importance of this issue <3)