how to call the /firefly/execute_path_from_file service

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Hey :) I want to use the waypoint_navigator to navigate a drone in a simuklation using rviz and gazebo. My plan is to draw a trajectory in rviz, which is published, transformed and written into the .yaml file, from which i can execute the path using the rosserive /firefly/execute_path_from_file from the waypoints_navigator package. Problem is: I dont get how to use the service. I gave it the entire path of the .yaml file, I navigated to the location and started from there. I always get the msg: Service arguments are: [filename.data].

Does anyone know how to use this propperly?

Kind regards