File types (.mov) not supported

I’m creating a prject that suppos to allow user to upload multimedia files…
So 1 field is varchar (200) type file upload, multiple…But, if I try to upload a .mov video it fail… saying
File not found [Filename.mov]
SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON dataAny clue?

See https://discourse.hkvstore.com/t/check-http-response/3213/1 and check actual PHP errors in HTTP response.