Downloaded photos from iCloud lost all the photo information l

See the article Set up and use iCloud Photos - Apple Support

On your iPhone, iPad or iPod touch

1. Go to Settings > [your name].
2. Tap iCloud.
3. Tap Photos, then tap the switch next to Sync this [device].

Download your photos and videos from iCloud.com

1. On iCloud.com, click Photos.
2. Select the photos and videos you want to download. 
3. Click and hold the download button  in the top right-hand corner of the window. If you want to download your content as it was originally captured or imported, choose Unmodified Original. For JPEG or H.264 format – including edits and even if it was originally in HEIF or HEVC format – choose Most Compatible.
4. Click download.