
Click "Photo/video" section, and then click "Add photos/Videos" to open the video uploader. Go to your Facebook page, and click "What’s on your mind" to start a new post. Otherwise, you won’t upload MP4 videos to Facebook.
The MP4 videos should be encoded with MPEG, H.264, or DivX codec. Otherwise, you need to shorten the video or compress video for Facebook at the very beginning. You can multiple videos as long as they aren’t longer or bigger than the limit. Facebook only accepts videos under 120 minutes and up to 4GB/10GB. Whether you’re using the mobile app, lite app, or desktop browser, you need to click or tap the "What’s on your mind" to start a post where you can add MP4 videos.
It is easy to upload an MP4 video to Facebook, but you need to notice the following clues before uploading.
How to Solve MP4 Won’t Upload to Facebook?