why can't i upload a mp4 video on this forum

[kmcesq]

just made my very first movie with music on iMac with iMovie and i saved it on my computer. when i try t upload as a file to show on my post it says file not supported???

 

[barefootbeachcombing]

You need to upload it to a site like YouTube or Vimeo and then post the link to the video here.

 

[kmcesq]

You need to upload it to a site like YouTube or Vimeo and then post the link to the video here.

Ok thank you