Not able to getresponse from the child integration in mapper for next step in parent integration

Summary

GETRESPONSE from child integration call is empty. Doesnt show response elements in mapper for next step

Content

Hey Experts, 

I have an issue with calling child integration from a parent integration. The mapper for next stage doesnt show anything under getresponse element where I would expect to see child integration responses. 

The child integration: accepts a file name and directory and then reads the file from an ftp folder and returns a JSON with filename and the file as an attachment. So a multipart/form-data response. This works fine using Postman if i call this integration directly.

 

Now I add this integration in a parent integration. On the next step, I want to use the attachment response in the mapper and send it forwards to next step in the parent integration. however, when i go to the mapper after child integration is called, I only see a GETRESPONSE complex type that doesnt expand. It doesnt have the json body and any attachment the child integration generates.