If i had to guess i would try this:
1.Streamer Assiant app on https://www.picoxr.com/global/software/pico-link
2.Download Streamer Assitant on Pico 4 in Store
Download Steam
Download Deovr On Steam for PCVR
Download SteamVR
Connect through USB on Streamer assistant
Pair Your OSR2 to Deovr in Deovr (inside Steamvr)
click on a video inside your video folder that contains the exact name of video and funscrript and it should work?
Name folder : Haley
haley.mp4
Haley.Funscript