File not found
I have trouble with the PDFs I upload to my Zotero folders. Although I save a copy of the file and the attachment appears in my online library, when I click it I am told that the file cannot be found and that it might be located outside of Zotero?
I use a Zotero for Firefox on my Mac.
I use a Zotero for Firefox on my Mac.
If so, make sure you have followed step 4 on the files not syncing page you link to. If so, then see the last point, below 6., on how to submit a debug log that we need to see what's going on.