i have tried so much! i tried running FNIS outside of MO, which did f*ck all, and i tried an older version of FNIS (6.2 instead of 6.3).the last thing that i have yet to try is NMM to see if that works, but it would be really annoying to constantly use NMM to install FNIS instead of using MO for this.
if it may help anyone figure this out, some animation mods had a V?.? behind the mod name and i'm using the XPMSE skeleton. all added animations would not work, only vanilla animations would work (running, jumping, swinging a weapon, etc.). when trying them they would not work, my character would just stand there in a T-pose. i did the normal steps: i enabled the mods that needed FNIS in MO, ran FNIS and updated the FNIS Behavior (with GENDER and SKELETON patches), installed the file's from the Overwrite folder in MO, enabled them and tried them. Creatures animations works, now i have some SL mods with responsive roll, crouch slide and other Nemesis dependable shit.I recently installed a couple of mods that use FNIS (because some are not appropriate i shall not list them here, more info below). When Nemesis is done, reactivate fnis generated files, so when you ready to launch game only FNIS main mod is disabled. Then i am disabling Fnis and Fnis generated files, and enabling Nemesis and Nemesis Generated Files. First you do Fnis as standard, but when Im doing it im disabling Nemesis and Nemesis Generated Files. Short version, what I do Left List order FNIS FNIS Creatures FNIS Generated Files Nemesis Nemesis Generated Files Everything else, animatinos, SL mods, etc. OK, I'm using MO2, instructions from post #19 actually works for me. Read more: The 2021 Morrowind May Modathon Month Modding Competition is Officially Over - 236 New Mods Released! Not sure about handling other mods like MNC overwriting any of the Nemesis/FNIS generated files if they load later (testing required). I have not tested this myself, but plan to (gotta make a backup first). Use SLAL to register animations again, reset creature framework, make sure creature anims enabled in SexLab options etc etc…
I just can't see how to add a 2nd flair for LE. I flaired this as PC-SSE Mod but it shouldn't be SSE specific. First post linked below is the method, 2nd post is someone testing it.