I get the following error
There is no .gitlab/.gitlab-ci.yml file in this repository, please add one and visit the Pipeline Editor again.
But as you can see in the screenshots, it is not true, and it seems to be a bug.
My Pipeline is working as expected and the config is picked up from the exact location, which the error is complaining about…
As the Editor is fairly new, i guess these are some minor bugs related to a different location then the default maybe?