I concur. The find duplicates feature cannot find dups that exist in "duplicate folders" - "duplicate folders", by the way, are generated by the sync feature, causing a cluster-frak of a mess. Those duplicates caused my quota to reach it's limit. Furthermore, when you search for dups, the script freezes in the browser, likely because EverHelper created those duplicates causing an overload.
If this is their diabolical strategy to make people upgrade, it won't work. They will do just as I did: STOP USING AND USE SOME OTHER TOOL.
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