You can share a folder or file with other users by cicking on the share icon next to the file or folder.
You can either share the file with a user that already has a login on the server by typing their username in the field that says "Name, federated cloud id or email address":
You can click the plus sign next to the "Share link" label to generate a random web address that anyone can use to access a file without a login:
By default, the link will be read-only and will expire in two weeks.
After you have shared a file and folder, how do you send the link?
Don't copy and paste the address in your browser. That seems to be the most sensible way to share a link but it won't work.
If you shared the file or folder with a user in the system, click the icon labeled "Internal Link".
If you shared the file or folder with an anymous user, then click the icon labelled "share link".