♻️(backend) allow uploading more types of attachments #309
+217
−49
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Purpose
We want to allow users to upload files to a document, not just images.
Proposal
We try to enforce coherence between the file extension and the real mime type of its content using magic.
If a file is deemed unsafe, it is still accepted during upload and the information is stored as metadata on the object for display to readers in the frontend.