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Issue with Flow in Tutorial: Upload Files to Sharepoint

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Posted on by AndreaStadtfeld

Hello everyone, I am currently participating in the PowerUp program, and am having an early stumbling block in the form of a flow that just won't work as indicated in the tutorial. I am working on this exercise: https://learn.microsoft.com/en-us/training/modules/controls-canvas-apps/upload-file

The first stumbling block is that this is outdated info, as there's a new V2 trigger from PowerApps. I think I have sorted this out, but my flow is not executing properly. When I click on the upload button in my app it tries to execute the flow. Monitor shows me the following error: Unable to process template language expressions in action 'Datei_erstellen' inputs at line '0' and column '0': 'The template language function 'base64ToBinary' was invoked with a parameter that is not valid. The value cannot be decoded from base64 representation.'.

I have attached a screenshot of the Flow, including the tooltip regarding the 'base64ToBinary' expression. I was following the tutorial 100%, so I am really confused where I must have gone wrong. Any help would be appreciated.

Cheers,

Andrea

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cchannon 4,702 Moderator on at

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You're trying to 'base64tobinary' a parameter that isn't in your trigger.

Take a look at that line:

base64ToBinary(triggerBody()["text_1"])

It's looking at your Trigger and trying to find a member there called "text_1"

But now look at your trigger:

There's nothing in there called "text_1". You do have a parameter called "FileContent" though. Try using that instead.

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Anchov 1,986 on at

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It seems the tutorial you're following might be a bit dated. You likely no longer need to use the Base64toBinary function, but there might be other changes to consider. I recommend following Mathew Devaney's tutorial, as it has worked for me recently, is very clear, and uses the new v2 connector.
https://www.matthewdevaney.com/power-apps-easiest-way-to-upload-files-to-a-sharepoint-document-library/

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Cheers!
Rick Hurt

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AndreaStadtfeld 7 on at

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That's not the fix, unfortunately. The 'text_1' variable comes from the Dynamic Content when I add FileContent to the expression. When I make your suggested change, I get this error:

I think text_1 is the correct variable.

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AndreaStadtfeld 7 on at

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Thanks for the excellent link. Following that blog post I was able to upload to Sharepoint from my canvas app.

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