Encrytion does not work for files in thumpnails

Moin,
it seems, that encrytion does not work for files in thumpnails …/data/user/ files/thumpnails/ folder?
That does not make realy sense?
Holger

It’s by design.

https://docs.nextcloud.com/server/10/admin_manual/configuration_files/encryption_configuration.html#files-not-encrypted

That makes sense, because …

The primary purpose of the Nextcloud server-side encryption is to protect users’ files on remote storage, such as Dropbox and Google Drive, …