when you make a skinned/bone rig in blender DO NOT name the root bone "root" like a reasonable person as the animation will not play in game (only studio) and you wil spend hours looking for the answer until you find a random devforum thread mentioning this
how it feels to finally start working on your roblox game only to spend the entire day fixing a bug that only 0.000001% of roblox devs get with 0 youtube tutorials explaining it and AI hallucinating you false ways to fix it