Does a Free Bidirectional PDF Sync Between iPad and Desktop Mac Exist in Zotero?

Dear Zotero Community,

After extensive reading of forum discussions, I've come to believe that Zotero might not offer a free solution for bidirectional synchronization of PDF highlights and annotations between an iPad and a Desktop Mac, including updates for newly downloaded PDFs. My library is roughly 15 Gb in size.

Additionally, I am interested to know if there's a way to sync only a current working folder or a subset of PDFs using the free storage space provided by Zotero? This could be a viable alternative for my needs.

Is my understanding correct regarding the synchronization capabilities, or have I missed a relevant discussion on this topic? Any guidance or links to prior discussions would be greatly appreciated.
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