Officially you cannot remote map or remote mount a My Cloud drive (at least a single bay/single drive My Cloud unit). WD removed that capability from the MyCloud.com web portal over a year ago. Unofficially someone in the dedicated EX2 subforum may be able to help or provide suggestions. In this subforum (My Cloud) which is generally for the single bay My Cloud units there is an unofficial app for the older first gen v4.x version single bay My Cloud units to enable remote drive mapping, but this unofficial app does not work on v2.x version firmware.
https://community.wd.com/c/network-attached-storage/wd-my-cloud-ex2
WD has previously indicated they do not plan to bring back the ability to remote map a My Cloud unit.
https://community.wd.com/t/re-enable-remote-drive-mapping-through-mycloud-com/134944
