The My Cloud is not designed to be used in that fashion. See the following thread where this issue was recently discussed and where it was basically determined its not possible with the way the My Cloud is officially configured because the My Cloud, when configured for remote access, will prompt the user for a login name/password.
https://community.wd.com/t/direct-link/145919
It may be possible to use unofficial methods, that would require using SSH to edit or load other modules to the My Cloud OS to attempt what your trying to do.
It may better to use one of the many free storage sites (like photobucket.com, etc.to host pictures you plan on using on websites or web pages. Yes its a hassle to upload photos to such sites but the benefit is having those photos backed up online rather than on the local network.
