If I upload a video to iCloud can it not be downloaded again?

Hi Debi,

Videos (and photos) can be downloaded from iCloud photo sharing. See this article -

iCloud Photo Sharing FAQ - Apple Support

In particular the section Can photos and videos be saved or downloaded from a shared album?

Yes. After photos are shared, anyone who can view the shared album can download and keep them permanently. Videos can only be downloaded to a Mac or PC. On an iOS device, videos are streamed from iCloud and can't be downloaded.

• On a compatible iOS device, you can save photos to your Photos tab or Camera Roll.
• In iPhoto or Aperture for Mac, you can add or copy shared photos or videos to your Library.
• On a Windows PC, you can copy photos and videos from a shared album to any folder.
• On the web, you can download photos and videos directly to your computer from the detail view of each photo or video.

Thanks for using Apple Support Communities.

Best,

Brett L