You can upload video to your page as long as you've first added a 'Web Section' that supports video. View the following article for instructions on how to add a section that supports video:
Upload video into Remixer
Any video you wish to add to Remixer must first be hosted on YouTube or Vimeo. You can then use the built-in 'Web Section' to add it to your Remixer page. It's currently not possible to upload a video directly from your computer.
- Click the 'Media' button on the top right.
- Click the link to view your options to upload.
- Click on any option and upload your images.