we have modified draw.io to add a custom UX, and now would like to be able to save documents. So far, we have just been serving the javascript from Apache, with no way to save. There appears to be a backend in the github repo, which is written in java, but the directions on the wiki (https://github.com/jgraph/drawio/wiki/Building) are a bit confusing.
The ultimate goal is to get our customized version up and running on our server, allow multiple people to view the same drawing at the same time, and when one changes it, the others see the change (the way it works now on http://draw.io site), and to be able to save drawings (on server, or Google Drive or Dropbox) and share links to saved drawings with others. This all works in other places, but we are unclear on how to get it working on our server. Any help greatly appreciated.