Binding Incorrect Type Error When Transferring File from Copilot Studio to Power Automate

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Posted on by RS-06020309-0

I am encountering an issue when attempting to transfer a file from Microsoft Copilot Studio to Power Automate using the Power Automate plugin. When passing the file as an input field in Copilot Studio, Power Automate expects the input type to be a file. However, in Copilot Studio, it appears that Power Automate requires the input as a record. This mismatch results in a "Binding Incorrect Type" error.

I have attached relevant screenshots for reference. Kindly assist in resolving this issue.

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MO-12020810-0 5 on at

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I'm facing the same issue.... Power Automate is expecting a "Record" type, but Copilot gives a "file" type...

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DuaS. 187 Super User 2025 Season 2 on at

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Hey,

Convert the file to a Base64 string in Copilot Studio before passing it to Power Automate. Power Automate can then decode the Base64 string back into a file.

In Power Automate, set the input field to accept a string (for Base64) instead of a file, and use the “Base64 to File” conversion step.

Confirm that the input schema in Power Automate matches the data being passed from Copilot Studio.

Try these steps and see if the error resolves. If you need more help, let me know!

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MO-12020810-0 5 on at

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@DS-09100503-0 any example & screenshots how to convert the "file" type to "string base64" type in copilot studio, and how to convert the "string base64" back to "file" type in power automate? i can't seem to find any information on this. thanks.

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DougM_Barhead 25 on at

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I have a similar issue.

When a file is attached to the chat I can create a variable of type "File" from System.Activity.Attachments.Value

But, I can't send this File to Power Automate.

PA allows the creation of an input variable of type File but I get a type mismatch when I try to pass File from CPS to PA.

I'd be interested to know how to convert to Base64 as suggested by @DS-09100503-0 - I don't think you can do that in PowerFX for Copilotstudio (which is an undocumented subset of PowerFX for some unknown reason)

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Lujain 2 on at

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Im facing the same issue

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DAnny3211 134 on at

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hi

see my video

https://www.youtube.com/watch?v=_bgCiMMWJzo&t=3s

DAniele

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