Power Automate - condition to send emails with or without attachments

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Posted on by DF-14041916-0

I've created a flow on power Automate to send emails based that we fill in one forms that I've created, one of the options is that we have is to send attachments. On this flow, we have a condition that is supposed to analyze if one or more than one file was attached or not.

My issue is on this part, so far, I can create this condition. I've tried empty(body('Get_response_details')?['UploadField']) is equal than "true" but is not working, I've also selected the attachment option to compare, but although is not working too. In both the sent e-mail but without follow the condition and don't bring the attachment. Someone knows hot I need to configure.

Follow below the images that how is my flow. I've removed the e-mail just to send these pictures.

Categories:

Building flows

flow 2.png

flow 3.png

flow 1.png

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Michael E. Gernaey 53,433 Super User 2025 Season 2 on at

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Hi @DF-14041916-0

If you want to know if a field had something in it (a file for instance)

By default its not going to be empty, and empty and null aren't the same thing.

So you should check for empty and null

or you can check the length(json(property)) as it creates an array. of the length is 0 there is none

If any of these help you, Please mark as such and maybe a like

Feel free to come back if you have issues

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DF-14041916-0 6 on at

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I've tried these options below

empty(body('Get_response_details')?['UploadField']) is equal to true
even without sending the form without an attachment, it goes to the If yes condition which is where the attachment is configured and gives an error

empty(body('Get_response_details')?['UploadField']) is equal to null
even if the form is sent with an attachment, it goes to the If condition and sends the email without the attachment.

length(json(property))
The expression in invalid

Is just need to know with option I can add here on the condition to the flow understand that if the form has one file attached he sent to e the condition "If yes" id don't has attachment needs to go to the condition "If no"

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David_MA 12,982 Super User 2025 Season 2 on at

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This is what Michael is referring to for your condition:

The expression on the left uses length() to determine how many attachments are included. The expression is:

length(outputs('Get_response_details')?['body/your-question-that-contains-attachments'])

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DF-14041916-0 6 on at

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I've tried like this image, but, returned this error below

length(outputs('Get_response_details')?['body/your-question-that-contains-attachments'])

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DF-14041916-0 6 on at

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someone knows how to do it?

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rzaneti 4,249 Super User 2025 Season 2 on at

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Hi @DF-14041916-0,

You can fix your expression to length(coalesce(outputs('Get_response_details')?['body/your-question-that-contains-attachments'], ''))

This expression will retrieve the qty of attachments if any, and handle the null scenario by retrieving a zero instead.

Let me know if it works for you or if you need any additional help!

✅ If this solved your issue, please mark it as Accepted Answer.
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