Yes apparently it is possible to see who accessed the My Cloud as indicated in the following thread:
https://community.wd.com/t/does-access-log-exist-for-my-cloud/149045
But where or which log contains the access information I don’t know, hopefully someone else can explain which specific log file holds the info. To access those logs one may need to use SSH. One can generate a system report through the My Cloud Dashboard which contains various log files.
