Cannot switch between multiple test payload

### Which Data Mapper Version are you using ?

v2

### Describe the Bug with repro steps

I have multiple test files i want to test the my mapping logic against. I have to copy/paste each of them which is time consuming and error-prone
The ask is to provide a folder which can house test files and allow using them during testing

### Screenshots or Videos

_No response_

### Version

5.44.9

### Additional context

_No response_