XF 1.3 .mp4 attachments

I just added "mov" in my attachment types within ACP -> Options. However, I cannot see the .mov file in my upload dialog box.

Here's my ACP settings....

attach.webp

As you can see, I even increased my max attachment file size to 20MB, but the file I am trying to upload is around 6MB. What's weird, is it doesn't even appear in the dialog box for me to choose the file.
 
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