Missing files

Hi, a month ago I synced Zotero with 4shared to have more space and today I noticed that some files have disappeared. They are not on Zotero (the C:\Usersersud\astud\Zotero\storage\ZKAAJAZ3\Guenther_2008 type of error) and they are not on 4shared either. What could have happened? Thank you so much.
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