title: Xcode how to add an external project
body: <p>I need to add an external project to my Xcode project, the reason for this is I need to add a Target Dependency on that external projects static library.</p>
  
  <p>I can't seem to add it in the way I need, I would like it like this:</p>
  
  <p><img src="https://i.stack.imgur.com/OmH5q.png" alt="enter image description here"></p>
  
  <p>However, when I add another project to my actual Xcode project I get the following which doesn't let me explore that project from my one and so I can't add the dependency I need.</p>
  
  <p><img src="https://i.stack.imgur.com/S1hac.png" alt="enter image description here"></p>
  
  <p>Note that these screenshots are from two different projects, and in the one which is showing me what I want to reproduce in my own project, dragging in multiple projects works as expected. </p>
  
  <p>Maybe I have some settings set up wrong in my project ? All I've done is take a template detail-master application from Xcode.</p>