Signing attachment in SoapUI

Dear Team,

I'm working on a solution where we have to sign Atacchments as well. i have referred to https://www.soapui.org/docs/soap-and-wsdl/attachments/?_ga=2.94449435.602208597.1692116189-493326442.1692116187 and all related post https://community.smartbear.com/t5/SoapUI-Open-Source-Questions/Signing-soap-message-mime-attachments-problem/m-p/106891#M18454

but seems this is not helping. can you confirm, if there is a way to sign them? Please advice.

Thank you