An API that connects multiple Microsoft services, enabling data access and automation across platforms
You might want to add some more detail in your question as it not clear what your asking.
As a starter there is a createreply method that allows you to create a reply draft message https://learn.microsoft.com/en-us/graph/api/message-createreply?view=graph-rest-1.0&tabs=http you can then add attachments https://learn.microsoft.com/en-us/graph/api/message-post-attachments?view=graph-rest-1.0&tabs=http to that draft and send