And the greatest drawback to this method: it’s one-way. If you make any changes to a reference within Mendeley, those changes will not be reflected in Zotero. This drawback is most apparent to me when I read PDFs. Let’s say I have a reference with an attached PDF in Zotero and I want to read it on my iPad (the Mendeley App has a native PDF reader, but you can also open PDFs in external apps, like iAnnotate). If I’m using the Zotero→Mendeley Desktop→Mendeley iPad app method, and I open that PDF on my iPad, any annotations I make on the PDF will not show up in Zotero.