Dyanmics Business Central API Updating/Patch an Attachment

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Posted on by g.hazel

I am trying to attach a PDF file to a Purchase Invoice.

I am able to create the attachment and get a valid response with the etag, etc.

I am not however finding any info on the format of the Patch call to update the attachment and provide the attachment content.

In Postman, I have these headers:

and the body looks like this now:

I have also tried sending the body as JSON with both "Content", "attachmentContent" keys and also tried both with and without the base64 prefix "data:application/pdf;base64,".

The file is created in Dynamics but it is a text file of the body verbatim so it isn't being converted from Base64 to PDF.

Anyone that might have worked with this and can help is appreciated.

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Dynamics 365 Business Central

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YUN ZHU 84,274 Super User 2025 Season 1 on at

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RE: Dyanmics Business Central API Updating/Patch an Attachment

Hi, hope the following helps.

Thanks.

ZHU