html - Why can't Macbook users upload MOV files to HTML file input forms?

Question

I am seeing a very strange behavior on a website I am developing where Macbook users are unable to upload MOV files from their computers to the following HTML input element:

<input type="file" name="video_file" accept=".webm,.mp4,.mov" capture="environment" required="">

When they click in input element, their file browser opens, and the MOV files appear greyed-out and disabled, thus they are unable to upload them to the web form. This relatively recent Google Photos support thread confirms that I am not crazy.

Unfortunately, I am not able to directly debug or diagnose this problem, as I do not have a Macbook handy.

标签： htmlformsmacosvideofile-upload