I found that giving the attachement rights to create attachments to anonymous users allowed them to add the draw.io diagrams but providing them with delete rights does not give them rights to edit the images, but if a person logs in they have the rights to edit.
Is there a way to do it or a limitation of the plugin that only logged in users can edit diagrams
We don't support anonymous user edit rights on diagrams currently. If we get additional requests, we can consider it as a feature.
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