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The images from a PDF attachment in a mail are corrupt + the flow won't save if I add base64

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Posted on by larouise

Hi! I am trying to create a flow that, long story short, should send an email with a pdf attachment and that pdf file contains a logo. I know that I should use base64 to convert the image but it's not working at all.

In the red box I've tried to put the base64 but i got an error while trying to save:

Does anyone know how to solve this issue?

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Nived_Nambiar 18,136 Super User 2026 Season 1 on at

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Hi @larouise

I could see that error message shown is saying that there is something wrong in expression under condition action highlighted, so correct the expression under condition so that you can save the flow

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larouise 17 on at

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Hiii! That's what I thought too... The error disappeared after deleting the BASE64 code.

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Nived_Nambiar 18,136 Super User 2026 Season 1 on at

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Hi @larouise

Quite strange- could you try to enclose the base64 code with double quotes like below

<img src="" ....../>

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Nived N 🚀

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larouise 17 on at

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Tried that... but is this the way to add base64 to that html?

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Nived_Nambiar 18,136 Super User 2026 Season 1 on at

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Hi @larouise

Try like this as well

https://powerusers.microsoft.com/t5/General-Power-Automate/Convert-Image-to-Base64-in-Power-Automate/td-p/1337955

Thanks & Regards,
Nived N 🚀

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larouise 17 on at

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Update: I have 3 pictures in the pdf and only 2 of them are working :))) when I put the base64 for the third one and try to save it, it gives me that error with the condition... maybe it's too much code in the Compose?

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Nived_Nambiar 18,136 Super User 2026 Season 1 on at

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Hi @larouise

don't think so, as i have tried to create a pdf file with 3 images and it worked fine

Could you show me what condition u have used ? is it anyway related with third image file ?

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Nived N 🚀

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larouise 17 on at

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The condition is very simple, I don't think is related in anyway to the images... can you show me how did you put the base64 in that function? When i try to do it, it says that the expression is invalid...

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Nived_Nambiar 18,136 Super User 2026 Season 1 on at

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Hi @larouise

Expression was simple it just take the file content data as input like below

Expression -

base64(outputs('Get_file_content')?['body'])

Now note one point here, image type which i have used was of type jpeg, that is why i have specified data&colon;image/jpeg; when specifying image content in html.

Thanks & Regards,
Nived N 🚀

LinkedIn: Nived N's LinkedIn
YouTube: Nived N's YouTube Channel
Blog: Nived Nambiar's Blogs

🔍 Found my answer helpful? Please consider marking it as the solution!
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