Using OpenAI Playground (web platform) to test Responses API with File Search results in error

I’m trying to test the Responses API via the Chat in the OpenAI platform while using the File Search tool as I used to do with assistants. The first query all works as expected but if I follow up with additional queries I get the following error:

“Item with id ‘xxxxxxxxx’ not found. Items are not persisted when `store` is set to false. Try again with `store` set to true, or remove this item from your input.”

This happens even when the same Vector Store is still associated with the File Search tools. I don’t see anywhere in the UI where to set the ‘store’ attribute to true so it seems can only be set when using the API.

Any one could explain if this is a bug or desired behaviour and how can I make it work?

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