So ridiculous there is STILL no app for the quest… however, I use the free skybox VR player… it can see my public folder on my “WD MyCloud” I just drop my 3D content in there and watch it no problem.
My Cloud Home Public Share Access on macOS Computer
https://support-en.wd.com/app/answers/detail/a_id/8757
in short… use this link in your browser on your compter… it will give you access to your public folder
the XXXXX is the last part of your drive’s serial number on the bottom of the drive.
smb://guest:guest@MYCLOUD-XXXXX/Public
