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Passing an image from PowerApps to PowerAutomate (or using a REST API)

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Posted on by Worthingtonnl

Hello,

I am building a reimbursement app and as part of the work flow we need to be able to pass a picture of a receipt the user uploads to a server that I can access using a REST API. Currently I am passing all data (amount, date, accounting info, etc) from powerapps into powerautomate to use the HTTP function and POST to the server. I have all my data working with this workflow except for images. I would preferably like to upload a raw image but base64 works as well I just need to get the uploaded image from PowerApps to my server using the Rest API. I was hoping I could just cite the image and get it using the .run command in powerapps to my powerautomate the same way I got the other data but that doesn't appear to work. Any Ideas?

Thanks,

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Building Power Apps

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timl 37,283 Super User 2026 Season 2 on at

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@Worthingtonnl

From Power Apps, you can call the JSON function to produce a Base64 encoded version of your image, as highlighted in the documention.

https://learn.microsoft.com/en-gb/power-platform/power-fx/reference/function-json

You can then pass that Base64 encoded image to your .Run command.

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Worthingtonnl 8 on at

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Hello @timl
Unfortunately I have tried that avenue as well and the results were... less than satisfying. It appears that the Base64 encoder built into powerapps has some sort of character limit as images that are more complex than very simple small low res pictures only produce partial outputs. Not sure if you have any other avenues or a workaround for that.

Thanks!

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timl 37,283 Super User 2026 Season 2 on at

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@Worthingtonnl

Unfortunately, I don't know of a simple way to overcome this. Perhaps an alternative is to save the image to a SharePoint or Dataverse data source. You could then try to retrieve the saved image from your Flow.

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