There are a couple of threads about that when it comes to VR.
This one is the easiest IMHO:
https://discuss.eroscripts.com/t/how-to-use-scripts-in-vr-picture-guide/20477
A much more extensive guide for all kinds of combinations can be found here. Not as easy to digest but it contains lots of information.
https://discuss.eroscripts.com/t/how-to-connect-your-147-sex-toys-including-the-handy-fleshlight-launch-kiiroo-keon-vorze-lovense-and-more-for-interactive-2d-and-vr-step-by-step-guide/8275
The most important things to remember are that the .funscript file must be named exactly as the video file except for the file extension and the script file shall be stored in the same folder as the video. That way the players will automatically detect the script file and load it. The funscript file can also reside in the Interactive folder in My Documents if you use the SLR/DeoVR app.