iOS app - viewing photos downloaded to cache

When viewing photos, each photo is downloaded to cache. Prompting the need to delete it (and hope I don’t actually delete it from the system).

Is there any cache management built in the app? I can’t see any setting for clearing it, nor any file limit.

How can I manage the cache?

I am looking for a solution to this as well. I need nothing but thumbnails unless I manually choose to download the photo. Otherwise it will kill my data plan!