The animation names are present in the skeletons.txt file. I have every other animation from Banzai's animation pack working. I downloaded the vanilla M2TW animation folder (unpacked) dropped in the animation folders from the Banzai pack and the Marka Horse pack, and then rebuilt the animation packs with the new content. However, in the Banzai animation pack that I downloaded, there are files missing from the Longbow string and Shortbow string folder. The problem isn't that I don't know how to properly install the animations; it's that the actual animation files are missing. If I try to assign a unit the longbow_string animation (and yes, it is listed in the skeletons.txt file) then the game crashes when the battle with that unit starts. The error log tells me that I'm missing several animation files for longbow string, the same files that were missing from Banzai's pack that I downloaded. What I'm saying is that the Banzai animation pack is missing files.
I'm implementing the models in vanilla M2TW, running off the Kingdoms.exe, so this isn't DLV. I could use DLV's animation pack to replace my own, and then edit my vanilla skeletons.txt file, but the DLV animation packs do not contain the Marka animations.
To be clear, the crossbow string animations work perfectly fine. It's the longbow and short bow animations that I lack the animation files for as they were not present in the Banzai animation pack I downloaded.
As for Nikossaiz's problem, it is occurring because the models were assigned vanilla crossbow animations instead of Crossbow_String animations created by Banzai that are implemented in DLV and other mods. It's not a problem with your work Sandy.