Analysis：
After uploading photos and screenshots to i.mi.com, you can also see the pictures in the cloud album in the cloud album in the gallery, but the photos there are thumbnails, not the original pictures.
Solution：
1. The local storage of the cloud album Each picture has two cached images, one of which is relatively small (as seen in the cloud album list) and the other is relatively large (as seen when a single photo is in full screen).
The storage location is: SD card/MIUI/Gallery/cloud/.microthmbnailFile (small image location) SD card/MIUI/Gallery/cloud/.thmbnailFile (large image location)
2. The thumbnails of these pictures in the cloud album are stored on the mobile phoneaximum is about 60M bytes.
3. Full-screen thumbnails (with a resolution of about 720*1280), each file is about 120K bytes, and the maximum is about 720K bytes. So don't worry too much about the local cloud album taking up too much phone memory.
Notes:
The .microthmbnailFile and .thmbnailFile in the storage location are hidden folders, which can only be seen after setting to show hidden files.