Help on Linking with Dropbox

I've managed to mess up Zotero while trying to arrange to have my pdf files stored in Dropbox and linked with Zotero. I started Zotero a few days ago (migrated from Papers 3), and by the time I had all my pdf's in I had used up not only the free 300 mb of space but also the $20 worth of 2 GB. Then I read about the method of using the links to dropbox and thought I had a solution. I have 2TB (and much unused) space in Dropbox, so it seemed like a perfect solution. But I have executed the change incorrectly, and now when I try to open a pdf in Zotero, I get the message "The attached message could not be found....."
I'm a computer novice. If anyone has advice on how to proceed to correct this, I'd be grateful.
Thanks.
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