Officially the methods of remote access to the single bay My Cloud devices is using WD My Cloud Desktop for Windows/Mac, MyCloud.com web portal, WD Sync, insecure FTP, and WD My Cloud app for iOS and Android.
WD removed capability to remote “map” a single bay My Cloud using the WD2Go.com web portal over two years ago. There have been numerous requests to bring it back, WD has indicated no plans to do so.
https://community.wd.com/t/re-enable-remote-drive-mapping-through-mycloud-com/134944/
It appears, at least on Windows for Me, that one can open and save certain files to a remote single bay My Cloud using the My Cloud Desktop program.
WD My Cloud Desktop
Windows: http://download.wdc.com/nas/WDMyCloud_win.exe
Mac: http://download.wdc.com/nas/WDMyCloud_mac.dmg
