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I have question how to convert base64 string to Binary or File type

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Posted on by Syed Waqas Nabi

I am looking to send image multipart/form-data to external API . The external API expecting file so I am creating content of it but I am facing problem with it. Anyone has done similar thing?

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Tom_Gioielli 2,303 Super User 2025 Season 2 on at

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I have question how to convert base64 string to Binary or File type

There are functions for this in Power Automate, so you can always do the conversion in Power Automate and store it somewhere in Dataverse on your table for your API to grab it.

There is a Base64toBinary() function in the formula portion of Power Automate that you can use for free.

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Syed Waqas Nabi 11 on at

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I have question how to convert base64 string to Binary or File type

This is my code I am using Base64 convert code unit to convert base64 string to outream then to instream but I always get error message":"multipart: NextPart: EOF","warning

if Image then begin

Boundary := '----WebKitFormBoundaryazjsjwikwllwWeWl';

ShopifyUtil.Base64StringToInStream(InData, InStream);

Content.WriteFrom(InStream);

Content.GetHeaders(Header);

Header.Clear();

Header.Add('Content-Disposition', 'form-data; name="image"; filename=' + ExtraData);

Header.Add('Content-Type', 'multipart/form-data; boundary=' + Boundary);

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