Unable to open hundreds of image files in my Cryptomator container

Help! I use Cryptomator to securely safe some important documents and images in my iCloud. Usually I work with pdfs but I also stored my biometric photos in the container. I just realized that I can open any image in any folder. I am hundred percent sure that they used to work just fine in the past. So I have to assume that the meta data got destroyed by opening/closing the container someday.

Is there any way to fix that and what is the explanation? File size seems reasonable, but I can’t open the Image or even the folder on iOS .