The scenario is straighforward: You receive a message with an attachment in Mail and double-click the attached file to open it in the appropriate app. But what happens next is anything but straightforward: file attachments are stored in a hard-to-find folder; they are sometimes downloaded more than once; and different apps treat these opened files in very different ways.
Where is /Mail Downloads?
When you open a Mail attachment with a double-click, it opens in its parent app, just as you’d expect. But it’s also automatically (and secretly) downloaded into the aptly named Mail Downloads folder.
The folder’s name is the only thing that’s obvious about it: it’s deeply buried in a series of folders, one of which is invisible. To view its contents, choose Go > Go to Folder in the Finder, type (or copy and paste from here) ~/Library/Containers/com.apple.mail/Data/Library/Mail Downloads, and click Go.
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