You can set ignores with wildcard. That can be used if you don't want to sync files with a specific extention. For example: you want to sync a vault, but don't need any of the .JPG files on that vault to be synced to your PC.
- open your Nomadesk Dashboard
- go to Ignores -> Manage
- type in a wildcard in the ignore field (e.g *.JPG) -> click Add + OK