Sharing folders

The inability to share folders is very inconvenient. It would really be helpful to organize envelopes according to our usage needs -- for example, by date that the envelopes will be used -- at different stages of completion. I would like to create a folder where other collaborators can add envelopes, or where I could move other shared users’ envelopes. As it is now, the only way to have all related envelopes in a single folder is to transfer ownership of envelopes.