How to send pdf attachment as raw binary data from transaction using urldata to external system

Summary:

We have a requirement of sending pdf attached to transaction to external system, how can we do this from BML

Content (please ensure you mask any confidential information):

Using getattachmentdata for getting the file content and passing it to external system using urldatabypost. This is causing error due to Base64 file content. When trying from postman with form-data or binary and selecting the file from local, it works without error.

Is there any way to achieve this from BML, to send the attachment as raw binary using urldatabypost?

Version (include the version you are using, if applicable):

25B

Code Snippet (add any code snippets that support your topic, if applicable):