Upload video to icloud?

Hi

I've just started using icloud to save a bunch of photos to. I've uploaded all my photos from one album, but I also have a few videos that I want to upload and can't figure out how to do it.

If I try to do it via the web browser, it says that only JPEG files can be uploaded. If I just copy and paste the video into the upload area in File Explorer, nothing happens. It copies over but it doesn't filter through to the other devices.

Can someone talk me through how to upload video?

Thanks