Can't update attachment with API v2

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Using API v2 and `PATCH` to update attachments, keep getting corrupted files.

I'm using javascript with this logic to create the stream:

const readableStream = new Readable();
// eslint-disable-next-line @typescript-eslint/no-empty-function
readableStream._read = () => {};
readableStream.push(fileContent);
readableStream.push(null);

This is the headers:

Accept: 'application/json',
'Content-Type': 'application/json; odata.metadata=minimal; odata.streaming=true',
'IF-MATCH': '*',
'User-Agent': 'axios/0.26.0',
'Content-Length': 413658

What am I doing wrong?

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Dynamics 365 Business Central

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YUN ZHU 97,168 Super User 2025 Season 2 on at

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Hi, I suspect it's an Endpoint problem.

The first thing to note is that this standard Attachment API is not Document Attachment (table 1173), but Incoming Document (table 130). Second, this requires specifying the parent ID.

https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/api-reference/v2.0/api/dynamics_attachment_update?wt.mc_id=DX-MVP-5004336

Although not exactly the same, I mention this in the post below in hopes of giving you some tips.

How to automatically upload files from OneDrive to Business Central with Power Automate (No customization)
https://yzhums.com/39365/

Thanks.

ZHU

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