From within the preview of the message, you can choose to open the document or email in question, or you can click on the name of an attached file in an email to open it. Unfortunately, though, CloudMagic changes the name of attachments when you open them; your file names are replaced with nonsensical stings of letters and numbers. If you save the document, that gibberish becomes your document name--not ideal for tracking. . I found CloudMagic very useful in locating attachments that I needed to update, but I do wish it would retain original document names.
That's a minor quibble, though. And it's one that I forget all about when I remember how fast CloudMagic's search tool is.