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Flow attachment Error

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Posted on by Community Power Pla... Microsoft Employee

Hello Reza. I am getting this error message when I try to attach an attachment using a flow based on following the steps on your youtube video. The error message is shown below. Not sure if it has something to do with the format of the file? or base64 format? If I run the flow without the attachment it works fine, so it seems to be something with the attachment.

The request failed. Error code: 'InvalidRequestContent'. Error Message: 'The request content was invalid and could not be deserialized: 'Unexpected character encountered while parsing value: {. Path 'attachments[0].content', line 1, position 659.'.'.

@RezaDorrani

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Community Power Pla... Microsoft Employee on at

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Hello, all hope someone can help me with the issue below. I have posted all the steps in my flow up until the error. Hope someone can help me solve the issue.

Error Message

@RezaDorrani
ScottShearer 25,331 Most Valuable Professional on at

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@Anonymous

In your array, replace "content" with "ContentBytes"

Additional information can be found here.
Community Power Pla... Microsoft Employee on at

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Thanks for the response Scott. I still get an error when I change it to ContentBytes at the Approval Step

This is the steps
ScottShearer 25,331 Most Valuable Professional on at

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@Anonymous

I had to play with this for a while....

This works for me - Content rather than content or ContentBytes when attaching to an approval:
Community Power Pla... Microsoft Employee on at

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Still get the same error message

I copied the output content in the array to see if this helps

{
  "Name": "2021-06-24T23_02_54.7849879Z.csv",
  "Content": {
    "$content-type": "application/octet-stream",
    "$content": "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"
  }
}
Ellis Karim 12,336 Super User 2026 Season 2 on at

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The flow should look something like this (my trigger was When a new email arrives in a shared mailbox (V2)):

{ "name": @{items('Apply_to_each')?['name'] }, "content": { "$content-type": @{items('Apply_to_each')?['contentType']}, "$content": @{items('Apply_to_each')?['contentBytes']} } }

Ellis
DennisTan 51 on at

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Hello All,

I came across the same issue and found a solution for it. You need to convert your content into base64 format. So your code should look like this:

{ "name":DisplayName, "content": base64(body('Get_attachment_content')) }
Verified answer

JDH138 53 on at

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Great job mate this did the trick!
tbomar 87 on at

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Can anyone assist. I'm getting similar error...
Error occurs at start & wait for approval when adding dynamic content for the attachments variable.

I tried following this tutorial - https://youtu.be/fSeGEBEs-kA

Here is my error message -

Here is code -
junortiz 4 on at

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Only for approvals in power automate, this from the image worked for me, also if it is added with expression format base64(body(‘Get_attachment_content_2’)?[‘body’])