Git Tips
Pulling new source branches
If you have forked the UE repository onto your local machine, and Epic create a new branch in their repo, you cannot see that new branch in the github.com UI.
To fix this, only local machine, where you have your local repo, do this (for example the new branch is 5.8):
git fetch upstream
git checkout -b 5.8 upstream/5.8
git push -u origin 5.8
Once this is complete, you can refresh the github.com UI and the new branch should appear in the branch dropdown.