Thumbnails on iOS App

Hi all. I have been trying out Nextcloud as a possible replacement for Google Drive and Onedrive for transferring files from our iOS devices to PCs but keeping most photos/videos just on the cloud to save local disk space. One problem I have come across which is preventing me moving over to Nextcloud is that if the local cache is deleted on the iOS app to save space, the thumbnail is also deleted and replaced with a play icon. Is there a way around this or is there a planned update to show thumbnails of videos/images stored only on the nextcloud server much like Google Cloud and Onedrive does?

Thanks in advance