How do you add a Pre-Roll if your PMS is on a QNAP NAS?

Whats the path for “Cinema Trailers pre-roll video” box in Extras? I currently have the pre-roll in a folder on the same QNAP NAS.

I have same problem have you figured this out? QNAP TVS-871-T

Video is in a separate Downloads folder inside my Plex Library along with same folders as all my movies and TV-shows and music all separated into their own folders as well

Look at Control Panel - Shared Folders and Edit Properties.

DataVol1 = /share/CACHDEV1_DATA

In this instance, the movies share beings at /share/CACHEDEV2_DATA/movies (CACHEDEV1_DATA on this system is a SSD)