XCode Cant' Edit CoreData Model

Question

After adding a CoreData Model to my existing project using

File > New > File... > Core Data > Data Model

I am unable to edit the m

Answer 1

I solved it like this in Xcode:

Right click on your project (not your project folder, I mean that one with the blue Xcode Icon!), than select "New File" and choose the right folder to save the data model.

Note: Clicking "New File" on the project folder itself or on one of its subfolders did not work somehow..