Hello @bsudabathula
To add an email attachment to a transactional message, follow the steps below:
1.
You can send emails via a SOAP message trigger. In the SOAP call, there is a URL parameter (attachmentURL).
2.
When designing your email, click Attachment .
In the Attachment definition screen, enter the SOAP attachment parameter:
<%= rtEvent.ctx.attachementUrl %>
3.
When the message is processed, the system will get the file from the remote location (third-party server) and attach it to the individual message.
Since this parameter can be a variable, it should accept the fully formed remote URL variable of your file, sent via the SOAP call.
Also refer this which explains in more detail and would help answer your queries.
https://docs.adobe.com/content/help/en/campaign-classic/using/transactional-messaging/use-case/trans...