Copilot Studio + Teams: Inline-pasted screenshots not available in System.Activity.Attachments (OCR flow never receives image)

I have a Copilot Studio agent published to Microsoft Teams that is designed to read error screenshots and return approved troubleshooting guidance.

The architecture is:

• Teams user pastes an error screenshot.
• Topic triggers.
• Power Automate Agent Flow runs OCR using AI Builder "Recognize text in image or document".
• OCR text is passed into a Generative Answers node scoped to an approved error-guidance document.

The OCR flow itself works correctly when tested directly and successfully extracts text from images.

The issue only occurs in the published Teams experience.

My question

Are inline-pasted screenshots in Microsoft Teams expected to populate: System.Activity.Attachments inside a Copilot Studio topic?

If not:

1. Is there another supported activity property that contains inline-pasted image content?
2. Is there a supported Power Fx formula for accessing inline-pasted screenshots?
3. Is OCR processing of inline-pasted screenshots currently supported in published Teams Copilot Studio agents?
4. Is the expected/supported approach to require users to upload the image as a file attachment rather than pasting it inline?

Any guidance on how to inspect the actual Teams activity payload that reaches Copilot Studio would also be appreciated.

Current behavior

When a user pastes a screenshot directly into the Teams conversation:

• The topic triggers.
• The image appears in Teams as "Image (Unspecified)".
• The OCR flow does not execute.
• No new flow run appears in run history.
• First(System.Activity.Attachments) appears to be empty.

The bot either:

• asks the user to provide an image, or
• returns a generic summary of the entire error document instead of the specific matched response.

Flow input

I am passing:

{

    contentBytes: First(System.Activity.Attachments).Content,

    name: First(System.Activity.Attachments).Name

}

to the agent flow.

This follows the Copilot Studio documentation for passing files to flows.

What I have already verified

• OCR flow works when manually given an image.
• Topic routing works.
• Topic runs in Teams.
• Flow output variable mapping is correct.
• Flow run history shows successful manual tests.
• Flow run history does NOT show executions from real Teams conversations containing inline-pasted screenshots.