Xcode 8.1 trouble adding storyboard for iPad to universal app with existing iPhone storyboard

Question

My app has been universal and has had iPhone storyboard. It works great.

Now I want to run it on iPad. Xcode complained of missing iPad storyboard.

Answer 1

1. I did File > New > User Interface > Storyboard and
2. named it "Main_iPad.storyboard". (Existing one has been Main.storyboard)
3. Went in to Main.storyboard > Select All > Copy
4. Went in to Main_iPad.storyboard and pasted.
5. Main_iPadStoryboard > select ViewControll > its properties > set "Is Initial View Controller"
6. Ran it and it works