We are trying to get an MP4 file to play on Confluence using the Multimedia macro. I can upload the file successfully and put it into the macro, but I can't get it to play. First it wanted me to Activate QuickTime, which I did, and then that plug-in crashed, and now when I click on the box where the video should be I get a big X with the message that says the video is corrupt. We are in Firefox, and have confluence version 5.5.6. Any tips would be great. Thank you!!