I have a wordpress multisite installation on one of my sites, and I'm trying to upload videos to one of the subdomains. However, whenever I try to upload a video I get the following message:
“WST - Intro.m4v” has failed to upload due to an error
Sorry, this file type is not permitted for security reasons.
When I try to upload that video to the main site, however, it works fine.
Can someone help me figure out what's going on here?