On my ipad with the WD Mycloud App all folders and files show when browsing my WD Mycloud 4 Tb drive.
On my computer in “files.mycloud.com” only 30 folders or files show.
Help
Try using a different web browser or use the iOS mobile app. Some have trouble using the MyCloud.com web portal where their web browser doesn’t show all the folders or files. There was one resent thread about it:
Use the forum search feature to find a number of other past discussions on this particular issue.