Attaching multiple files from Email received trigger to a Send an email action?

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Posted on by KP-05022303-0

Hi all,

I am trying to build a flow that received 3 .PDF documents
1. A100.pdf
2. B200.pdf
3. C300.pdf

A100.pdf is later used with the AI modal to extract information, and the initial email itself is being exported, converted and saved as a PDF which will also be attached. So, in total my last 'Send an email' action needs to have 4 attachments - Exported Email.pdf, A100.pdf, B200.pdf and C300.pdf.

I have only managed to get A100.pdf and Exported Email.pdf to attach successfully. I tried looping through all of the attachments and appending them to an Array variable - however the received email had corrupted PDFs and/or blank white pages

My flow is as follows:
1. When a new email arrives in a shared mailbox (V2)
2. Export email (V2)
3. Create file
4. Convert file
5. Save to PDF
6. Get file content (steps 2-6 are used to save the email as PDF and attach it later)

7. Apply to each (attachments from the trigger)
8. Condition (checks for attachment name A100.pdf)
9. Get attachment
10. Extract information from documents

11. Compose email body using data from step 10.
12. Send an email (V2)

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Building flows

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trice602 15,404 Super User 2025 Season 2 on at

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Hi,

Here is a working flow. In this example, I am sending 15 attachments in the send email action. The key here is for the content type, you need to use the expression base64ToBinary(), otherwise as you mentioned, the flow works but the content is corrupt.

It sounded like you were 100% on and on the right track with an append array action, but most likely had an issue with the file content.

As you already know, selecting the attachment name dynamic content will wrap your append action in a for each shown below. For your ContentBytes, you are using the expression base64ToBinary() and selecting the Content Bytes from the trigger.

Lastly, OUTSIDE of the for each, use the send an email action and reference the Attachment1 variable in the attachment section.

Works in testing. This is almost an identical for when you want to work with multiple attachments from a Form submission, same framework, different trigger.

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Tom

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KP-05022303-0 4 on at

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@trice602 thank you so much!

As you said I was 100% on the right track, I was just missing the base64ToBinary() function in my expression and now it works like a charm!

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