Note requirement to explicitly enable multipart as an input format #1943
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V3.3 has become more strict about input format checking (intentionally or otherwise) and users need to be more rigorous in allowing multipart when using it for file uploads.
Prior to v3.3, I suspect people should have been defining this, but it wasn't being checked, so many won't have done.
Not sure my "note" format is in the preferred document style - possibly we don't want to mention the version for example? Feel free to edit or request changes.