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Copilot Studio Agent in Canvas App Not Responding to PDF-Based Questions

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Posted on by JS-28011156-0

Hi everyone,

I’ve created a Copilot Studio agent whose only data source is a PDF document. I then integrated this agent into a Power Apps Canvas App using the Copilot control.

So far, the integration works as expected:

The Copilot icon appears floating in the bottom‑right corner of the app.

The chat window opens correctly.

The agent can answer general questions that are not related to the PDF data source.

However, the problem is that any question related to the content of the PDF returns no answer at all. There is no error message—just no response. It seems as if the agent cannot access or use the PDF inside the Canvas App, even though it works normally inside Copilot Studio.

Has anyone experienced this issue or found a workaround?

I’m trying to understand whether this is a configuration problem, a limitation of the Copilot control in Canvas Apps, or something else.

Thanks in advance for any support!

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Building Power Apps

Error handling

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Sam_Fawzi 902 Super User 2026 Season 1 on at

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Hi @JS-28011156-0,

This is a known limitation of the Copilot control in Power Apps Canvas Apps today.

While PDF knowledge sources work correctly when testing the agent inside Copilot Studio, that same PDF‑based grounding isn’t currently supported when the agent is surfaced inside a Canvas App using the Copilot control. In that context, the agent can answer general questions, but questions that rely on PDF content may return no response, without an error.

You’re not misconfigured — it’s a platform limitation.

To help suggest the best workaround, could you share a bit more about the business scenario you’re trying to enable?

For example:

Why does the copilot need to live inside a Canvas App? can share it on teams or M365 copilot agents list?

What are users trying to do with the PDF (search, summarize, extract data, guidance, etc.)?

With that context, it’s easier to recommend the right alternative (different host, flow‑based approach, restructuring the data source, etc.).

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rajeshjamrodh 2 on at

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With a Copilot Studio agent backed only by a PDF and surfaced in a Power Apps Canvas App (Copilot control), here are the key considerations and improvements:

What works well
The agent uses retrieval over your PDF (semantic search + grounding) to answer questions.
Easy embedding in Canvas Apps for end users—no custom UI needed.

Common gaps to watch
Chunking/quality of PDF: Scanned PDFs or poor structure reduce answer accuracy.
Hallucinations when answers aren’t in the document.
Limited context awareness of app data (it only knows the PDF).

Best practices

Improve the knowledge source

Use a text-based, well-structured PDF (headings, sections).

Split large PDFs into topic-based documents for better retrieval.

Tighten grounding

Enable “only answer from sources” (or similar setting).

Add citations so users see where answers come from

Prompt design

Add instructions like: “If the answer is not in the document, say you don’t know.”

Add context from the app

Pass user/context variables (e.g., customer ID, case type) into the Copilot control to guide responses

Fallback & actions

Configure fallback topics (e.g., create a ticket, escalate).

Use Power Automate actions for workflows beyond Q&A

Testing & tuning

Test with real user questions; refine content and prompts.

Monitor usage and refine weak areas.

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JS-28011156-0 9 on at

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Hello guys,

thank you for your answers!

After a long trial and error process in the last months, I can say that the copilot now responds to the questions based on a pdf data source - from inside the canvas App!

To be honest, I dont know what I did different, maybe Microsoft enabled the functionality in the meantime.

Nevertheless, I am happy that we can now work with the copilot control from within the canvas App with our own PDF based knowledge sources.

BR

Jan

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