Hi there, we had trouble making quote work reliably and so deprecated in the v2 version of the API. We are planning on making some model improvements to bring it back in the future.
What you are seeing in the playground when you hover over the citation is just the file name. i.e. we are simply retrieving the name of the file based on the file_id returned in the citation using the v1/files endpoint.
Thanks for your feedback here.