Windows 7 copying files to My Cloud with Full Access permissions

My Cloud OS 3 Personal & Network Attached Storage My Cloud
8

What you’re seeing has nothing to do with permissions – you said you’re able to rename the files, but it’s doing it in a weird way. 

If that’s all you’re wondering about, it’s probably related to a bug:

http://community.wd.com/t5/WD-My-Cloud/Editing-Picture-Metadata-or-File-Name-Not-Working-Properly/m-p/631991/highlight/false