Git clone + switch branch to PR

I contributed to a remote repo via pr.
I opened the PR in the web interface.

All good so far.

Now I want to contribute another file which I have on my local.
I want to
git fetch && git checkout -b refs/pr/2 add the file and then git add * && git commit -m 'message'

I encounter issues with not being able to fetch and checkout.

have you cloned the repository first? just in case, the instructions are here: vidore/colpali-v1.2-merged · Hugging Face

Of course! Upon git fetch, i only see the main branch available

git fetch -a maybe

Also didn’t work.

Maybe same as this issue.