Using Siril to work with Monochrome Camera and Narrowband filters

I am struggling with how to leverage this help in getting my images taken with my monochrome camera using each of my narrowband filters into a color image. I have fit images for H, O, S, and L filters taken with the monochrome camera and I want to stack them and then work on post processing to get the Hubble colors. I tried the mono preprocessing without flats script, and I am really impressed with the quality of the stacking but not sure how to do anything further with the final fit result file because there are no separate channels. If you have a video on this that would be great.

Hello and welcome, tutorials are on Siril’s website, please take a look at this: Siril - RGB composition
Good luck!