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Copilot Studio to Power Automate – file input error (UnspecifiedDataType type mismatch)

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Posted on by CU26070553-0 17
Hi,
I'm trying to send an uploaded Excel file (`.xlsx`) from Copilot Studio to a Power Automate(Agent) flow. The flow expects a file parameter, but I get the following error:
 
Here is my Error Message
 

The flow ‘My Flow Name’ (Flow ID) failed because the parameter named file was declared with type UnspecifiedDataType. This type is not supported when invoking Power Automate. Currently, only Text, Boolean, and Number types are supported.

Error code: FlowActionBadRequest.

Conversation ID: ConverSationID

Timestamp (UTC): 7/26/2025 5:41:02 AM

 

I attached Two images 
First image is Copilot Studio's topic and the excel's filetype is "Record".
 
And the second image is Agent flow
the agent flow's excel file type is "File"

How can I Integrate this file type ?

Expected:

 

I want to send a file from Copilot Studio that Power Automate can recognize and process properly — preferably as an attachment or stream.

 

Is there any workaround, or planned support for passing file-type parameters from Copilot Studio to Power Automate(Agent Flow)?

 

 

 

Categories:
Calling actions from Copilot Studio
I have the same question (0)
  • Verified answer
    Michael E. Gernaey Profile Picture
    Michael E. Gernaey 53,493 Super User 2025 Season 2 on at
     
    The issue is you are not passing a Record of data to Power Automate. I cannot see and you didn't share the actual expressions, but Copilot does not have a Record property, it has the FileName and the attachment stream
     
     
    Can you please share your expressions
     
    You will need to pass the correct format, by creating it in a Power FX expression
     
    Cheers.


    If these suggestions help resolve your issue, Please consider Marking the answer as such and also maybe a like.

    Thank you!
    Sincerely, Michael Gernaey

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