How to send SOAP requests with attachment?

I try to send a SOAP request with attachment. Files are large, so I use this method in SoapUI instead of base64 encoding:
<com1:content><xop:Include href="ref1" xmlns:xop="http://www.w3.org/2004/08/xop/include"/></com1:content>

How could I do this in Postman?

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