There are a few reasons why astored filemight not be found:

1. You created the file on another computer and it hasn't yet synced to this computer.See Files Not Syncing.
2. 188BET靠谱吗The individual file was moved or deleted outside of Zotero.You can use the Locate button in the File Not Found dialog to select the file.188BET靠谱吗When using Locate, if you select a file that was renamed within the original storage directory, Zotero will update the database to point to the new file!if you select a file elsewhere, it will copy the file to the correct storage directory.
3. You moved or deleted the 'storage' directory within the 188BET靠谱吗Zotero data directory.
4. 188BET靠谱吗You somehow ended up using a different Zotero data directory from the one you were using previously on this computer, and you're either viewing a different database or you synced down data — but not files, which might not be available online — from the online library.In this case, it's better to 188BET靠谱吗locate the correct Zotero data directoryon this computer.

188BET靠谱吗Note that Zotero never deletes files on disk while their corresponding attachment items still exist in the database, so if your files are missing, either they haven't synced or something happened outside of Zotero.