Unable to add folder to git repo

Question

I think this issue has already been discussed under this question :

Recursively add the entire folder to a repository

However I still can not add some folders t

Answer 1

The long answer above is great but the TL;DR to fix it is:

1. remove the .git repo of the sub-repo
2. Run git rm -r --cached .
3. Run git add .

then git status should show you the folder added