Image files with the extension jpg or png can be registered to the Clipboard.
Drag and drop image files from your device to the Clipboard to register them.
Video files cannot be registered directly from your device.
Please upload the video file to a Step first, then register that Step to the Clipboard.
Related:
Upload video (Web Browser)
https://teachme.jp/8/manuals/7899324
Use clipboard function (Web Browser)
https://teachme.jp/8/manuals/11054649