You can from the Web-client also share your data-share with others.
Go to the sharelist and click/or right click the file, a menu/ or pop-up is shown and from here, you are able to share the share.

It will redirect you to a new page (share settings) where you can depending on your user status, invite new users or existing users to the share.

If the user not is shown on the list, start typing name in the “Search / Add user” field.

If the user is a new user (never been using you will have to click “Invite user” in the top menu.

If you share with an user who is not using the system already, the user has to activate his/hers account before using the share.

If you are an external user, you are not allowed to share the data further.