For starters you CANNOT officially map the My Cloud remotely. WD removed that capability last year. You can only map the My Cloud while connected to the same local network as the My Cloud. Further if you are on the same local network as the My Cloud there is no need to use the MyCloud.com web portal. Instead one can simply use Windows File Explorer, Mac Finder, or a file manager app for one’s mobile device to copy data to/from the My Cloud.
More information on how to map a My Cloud Share:
http://support.wdc.com/knowledgebase/answer.aspx?ID=2676
http://support.wdc.com/knowledgebase/answer.aspx?ID=2686
If you haven’t done so already you should read the My Cloud User Manual (http://support.wdc.com/product.aspx?ID=904) to understand the various features of the My Cloud and how to use them.
Unofficially, and absolutely not supported by WD, if one has an older first generation v4.x firmware version My Cloud they can install the unofficial CloudDAVMod to regain the ability to remote map their My Cloud. This ONLY works on the older v4.x My Cloud and one cannot downgrade a newer v2.x firmware My Cloud to the v4.x firmware as the two single bay My Cloud models use different hardware and different firmware.
https://community.wd.com/t/app-clouddavmod-various-versions-for-firmware-v4-09-2016/161543
