Steps to reproduce:
I opened the preferences and scrolled to the "files & attachments" list.
With no filter specified, the list shows exactly three entries:
"application/x-ms-wmz type" (what's that???), "http" and "https"
No entry for pdf, no image, video or audio entries, ...
Also, filtering the list seems to behave strange:
When typing "pdf" in the filter, the list shows pdf (as expected).
Filtering for "document" results in two entries: Plain text and pdf.
"zip" or "archive" also shows the entry for "zip" (but no other archive types).
But when typing "jpg", "jpeg", "image", ... the list shows no entries at all.
For "video", "mpeg", "av1" etc. the list is also empty.
"csv" is also unknown, and "xml" shows "Microsoft word (open xml)" instead of plain xml.
With no filter specified, the list should show all entries, not only three.
Entering filter strings shows that there are definitely more entries than the three entries shown without filtering (e.g. pdf, plain text and zip), so the list without filtering is incomplete.
But many document types seem to be really missing, e.g. all image, video and audio types, html, xml and csv, ...