Can I protect a file or a folder that I share with a password?
Yes. When you click the Share button next to a file/folder and select Send Link, a new window pops-up. If you want to protect your shared file/folder with a password, tick the Link is unprotected checkbox. The password will appear next to Copy link to share. If you are sharing your file/folder using the Add People option, the content is already protected, because you need to have a registered Koofr account to access the file/folder that is shared this way.
Note: For potentially malicious types of files (.exe, .zip., etc.), the password is set automatically and you will not be able to switch it off. Password protection is mandatory in those cases due to antivirus and browser requirements.