Using the draw.io plugin, I can create, edit and save a diagram successfully, however, when I publish my confluence page, I see "Error: Invalid descriptor" in place of my image.
The draw.io .png and .xml files have been successfully added to my page, but confluence seems to be failing to locate them.
When I go back in and edit my page the draw.io macro is still there, but when I edit it it behaves like a 'blank' draw.io drawing.
I'm not associated to draw.io or something but I ran into this problem also and maybe my workaround will get you back on track for the time being.
I also had problems when creating a new diagram, which after saving did not appear on the Confluence page, even though the attachments were there.
What I did was the following:
If you already had created a diagram which doesn't even show the macro in page edit mode:
Note that all revisions will now be saved under the new name you chose when you created the empty diagram.
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