Officially no there is no way to do so. What version of My Cloud do you have? Unofficially, if one has a 1st gen single bay/single drive v4.x firmware My Cloud, one may be able to attach a file if they use the unofficial CloudDAVMod for v4.x My Cloud’s to remotely map their My Cloud.
https://community.wd.com/t/app-clouddavmod-various-versions-for-firmware-v4-12-2016/161543
WD removed the removed the official remote map capability from the MyCloud.com web portal over a year ago when they released the OS 3 firmware.
