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Attachments are corrupted in Outlook

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Posted on by CU28050849-0

Hi,

I have a Power Automate flow that triggers when a new email arrives from customer. The next action is to send an email to a PIC, where its content must include the attachments sent by customer.

Here are the flow processes:

1) Initialize array variable "colAttachments"

2) Filter array to include only relevant attachments:

3) Apply to each Filter Array output:

json(concat('{ 

  "Name": "', items('Apply_to_each')?['name'], '", 

  "ContentBytes": "', outputs('Get_Attachment_(V2)')?['body/contentBytes'], '" 

}'))

4) Send email to PIC

So when the PIC receives email, she cannot open the attachment:

Please help me figure out the solution for this.

Thank you.

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Ellis Karim 11,012 Super User 2025 Season 1 on at

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Attachments are corrupted in Outlook

Hi @CU28050849-0

This is a "known issue", unfortunately. Please try the following, which uses a modified "Append to Array" action:

We don't need to get a Get Attachments action, because the body of the email already contains all the attachments.

The expressions I used are shown below. This code can be copied and pasted as is:

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

Or, if you want to type in the expressions yourself:

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

Here is the sample runtime output of the Append to array action:

To learn more, please see:

Power Automate: Formatting File Attachment Arrays for Approvals, Outlook, OneDrive and SharePoint – Ellis Karim's Blog

How to Save Files to SharePoint Without Corruption Using Power Automate – Ellis Karim's Blog

Ellis Karim
Blog | LinkedIn | Bluesky
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