Previous attempt dropped both video/quicktime and video/webm citing
narrow platform support. Re-investigated:
- Modern .mov files (iPhone recordings, screen captures) are ISO BMFF
containers — the same format MP4 uses. Social platforms decode them
like MP4 even when PHP's mime_content_type() reports
'video/quicktime'. Postiz quietly accepts MOV via this same trick:
their file-type lib detects the magic bytes as 'video/mp4' and
renames the upload before storage.
- WebM is genuinely incompatible (Matroska + VP8/VP9 stack) — X / IG /
TikTok / FB / Pinterest / Bluesky / Threads all reject it.
So allow MOV, keep WebM out. Rejecting MOV would force every iPhone
user to transcode before uploading — real UX cost for no gain since
the publishers handle it.
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