Cache is set to 5Gb, but for some reason the files won't stay

My phone is a Galaxy S22, and I have a Cryptomator vault stored on my OneDrive account. I configured Cryptomator to have a 5Gb local cache on my phone, and I have a couple of files that I access constantly that are well below this limit. The issue here is that I always have to redownload those files, while the expectation was for it to already be on my phone. Those files are not altered in any way in other devices, and are only viewed, never edited.

What could be causing this issue? Is there a fix?