How to turn off compressing my pfotos and videos in icloud

Hi! After uploading photos and videos to iCloud, they are all compressed! it says in the information 2160 × 3840·28.1 MB·Dolby Vision

30 k/s

0:09

! if I try to download, the file is 10 times smaller(2mb) and the resolution is 720P! how to get the originals??