Cannot select vector store to attach

I encountered a bug during usage of the Playground and creating an assistant.
The attach file to file search does not allow one to chose and attach an existing vector store within the assistant window in the Playground.
I have created a vector store, uploaded files to it and copied the ID. No matter what I do it cannot find any of the vector stores listed.
Maybe I do miss something here, but given that the usage of the feature is so straightforward, I fear it could be a bug.
I use Chrome as a browser.
If anyone of you could help me with a work around I would be happy.
Best
Markus