Struggling grounding agent from knowledge base

[AlessandroMartinelli]

Hi everyone,
I'm trying to configure an agent so that, when answering, it uses the provided technical documentation to answer technical questions.

I've successfully created a search service, a storage profile, I've connected with Azure Storage Explorer and uploaded a couple of example files in a container, I've created the knowledge source of type "azure blob storage" and connected it with the mentioned container, I've created a knowledge base and connected it with the knowledge source.

However, when I open the agent playground and then I select the appropriate knowledge base and send some question, the answer explicitly mentions it couldn’t find the specific technical documentation.

I'm not sure where the problem is. For sure, I don't know how to trigger a knowledge base update from the provided documents.

Please note I'm using Microsoft Foundry (new)

Can you please provide some hint?

EDIT: Please note if I upload the same file under "tool", the chatbot uses it successfully, answering with information from the file.

Thanks!