How to Know Sync process ratio?

edited June 10, 2022
As i add 400 books about 6G size to zotero, sync has work 2days. I don't kown how much has it done; but the web library dont changing at all.

I have two questions:
1. It seems sync works like sync all delta-change once time, rather than one by one? Can i set to sync one by one?
2. How to debug this problem, for example, how much process has sync done?

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It works now, as i clear web-library trash and restart zotero..
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