Deleting "~***.cr" file in a Directory: risk?

I habe a Problem with synchronization of a directory with my nextcloud.

In the vault in this directory I see some files with “~” at the beginning. I seems to me that in this files lies the problem. So I deleted the Files (after backup the directory for a restore :slight_smile: ) After this action the synchronization works without problems.

Are these files of cryptomator and which function have this files? What are the risks of deleting such files?

Thank you for a answer.