GitHub shows a submodule instead of a subfolder

Question

Git unconsciously created submodule from my subfolder where there was.git lately. I deleted.git and there's no git files like.gitignore but still can't add files to this subfolder. It looks like this

And inside io-invoices (submodule) I've got

I've checked hidden files.

Answer 1

You probably need to remove that directory from the Git tree and re-add it later. Backup everything before!

git rm --cached ./io-invoices
git add ./io-invoices