Is it possible to copy My Library to a new Group library?
Looks like files would need to be copied individually, not possible to move single or multiple folders?
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Upgrade Storage
If a collection has been previously dragged, you can delete it in the target library and drag again to update it, or you can just drag all items in that collection in the source library to that collection in the target library and Zotero will automatically add any previously copied items to that collection.