Yes I’m using OS X tags in my files. ( file meta data; in the file attributes ) Both Dropbox & Icloud sync my tags by supporting the full file attributes.
…somehow WD’s implementation of Sync is not…
…in other words it’s not application specific like Microsoft Words version of “tags” or a separate db file of tags.
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OSX saves tags as an extended attribute , in com.apple.metadata:_kMDItemUserTags. You can check them yourself by using the mdls command like this:
mdls -name kMDItemUserTags Hello
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To answer your question, I would say then that the file metadata is NOT being transferred across in the sync.