How to implement document summarization feature in Microsoft Copilot Studio?

Question

I am attempting to add a document summarization feature to my custom Copilot in Microsoft Copilot Studio, but I am having difficulties. I have followed these steps:

Created a new Copilot.

Added local files to Knowledge Store.

Enabled Generative AI in Settings.

However, when I attempt to summarize my uploaded files, Copilot prompts me to upload the document to an input box. Unfortunately, there is no feature to upload files from the input box.

I tried publishing the Copilot and adding it to Teams so I could attach a document in Teams and see what happens. Unfortunately, Copilot cannot read or process document uploads. It gave me this response:

"I'm sorry, but I can't read or process document uploads. However, if you provide me with the text or specific details from the document, I'd be happy to help summarize or answer any questions you have! 😊 How can I assist you today? AI-generated content may be incorrect."

I also tried uploading files to OneDrive and providing Copilot with the URL, but it didn't summarize the files.

My requirements are that I want to summarize files using my custom Copilot in Microsoft Copilot Studio and that the files can be uploaded in the following ways:

Manual Upload

SharePoint/OneDrive

Azure Storage Account URL

User can attach files in Teams

How can I accomplish file summarization in my custom Copilot? I have attached a screenshot for reference.