Live level editing

I created a private server to be able to edit a map with a few people. Quickly I realized this isn’t going to work as no one else could see my edits unless I rebuilt the and relaunched the server. I was hoping we’d be able to see each other’s changes, and just save & update the .zip when the session was done. Is this possible? I might be able to get it to work using multiseat and steam remote play, but that limits it to 2 people afaik.