Feature request: Deleting cached photos without deleting thumbnails

When I browse through the photos, each one is loaded into cache. If I look through, for example, an album of 1,000 photos, each one stays in the cache, and that takes up about 3 gigabytes of space on the device. The only way to free this space is to clear the cache, but along with downloaded photos all the photo previews are also deleted at the same time, all the information about folders, paths needs to be re-synchronized, and it's rather inconvenient. Especially when you have to scroll through all of them to load the previews.
It would be nice to have a feature to manual and auto delete only downloaded photos without everything else.

Alternatively - take the Google Photos path. If I'm not mistaken, it doesn't download full size photos at all, only if you try to share the photo or save it in the gallery.

Start by tracing the iOS photo cache and existing clear-cache flow; the issue names no files or tests. Define the manual and automatic deletion behavior while preserving thumbnails and folder/path metadata, then add coverage for those behaviors.