It looks like you are trying to share the 'Published' folder, which is not possible. Rt click on your 'Examples' folder, and you will see a share option. You can learn more about how to use the Published folder here.
If you will continue working on your desktop, consider looking into MATLAB Drive connector. This allows you to sync you MATLAB Drive folder to your local desktop, meaning you can work on your files anywhre - desktop or online - and the changes sync everywhere.