Can I collaborate with a colleague on a DrawIO diagram if I have the DrawIO plugin?

[AgileBitFlipper]

I have Confluence server, self-hosted v7.5.0.
I also have the latest DrawIO plugin.  
I have a self-hosted DrawIO server available.

What I need to know is, can my team collaborate on a single DrawIO diagram.  If so, working with this configuration above, what do I need to setup in order to make this happen?

I have DrawIO files attached to pages, and I have a single DrawIO diagram ON a page using the {drawIO } macro.  I'm not sure if there is a difference here that might impact our success with collaboration.

I can tell you that the Atlassian Companion does allow versioning of the DrawIO attached files, but the editing is solo, not collaborative.

[David Benson _draw_io_]

Does the diagram have to be stored on that server, or is embedding from a cloud storage, like Google Drive, an option?

[Andrew Montcrieff]

We operate from a self-hosted SCIF-like environment, so the document would have to be at rest on the platform with no access to internet resources.

[David Benson _draw_io_]

For the self-hosted Confluence with diagrams stored on the server, there's no live collaboration for draw.io. There is sync and merge functionality, though, rather than just last write wins.