3rd part tool not able to send attachments to HP Service Manager

I am integrating HP Service Mnager with a third part tooi called Alert manager. We are using SOAP API for the integration

The ticket creation is working fine but when we are trying to add attachments they are not coming through.

We tried attaching attachments from SOAP UI and it works fine. Used the similar coding from the 3rd party but to no success. Can anyone let me know if any such issue has occurred and how it can be fixed.