Recovery of collection is impossible
1.If you delete a file from Zotero, it will appear in recycling bin. If you delete a collection it won't appear in recycling bin and you can kiss your collection goodbye.
2. If you recover a file from a recycling bin, Zotero won't tell you where it's gone (assuming that you forgot from which collection you deleted the file in the first place).
2. If you recover a file from a recycling bin, Zotero won't tell you where it's gone (assuming that you forgot from which collection you deleted the file in the first place).
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dstillmanFor #2, http://www.zotero.org/support/kb/collections_containing_an_item works for items in the trash as well.