I'm using solid explorer to access images on my owncloud server. I've got a lot of images there and I have to manually scroll through all of them page by page to get thumbnails generated for them. So I can find images easily when having only mobile connection. This is not very convenient and takes some time but works. But the problem is, that those thumbnails don't last long. After some days, they seem to be removed and then I have to generate them manually again, which sucks. How can I avoid something like this?