>>336890013
the upper limit for Poor is 4 materials, 2 meashes and 20k tris

pretty much everything else is not allowed

you also need to use quest compatible shaders

After getting things toned down in Blender you just make a Quest compatible project (target platform Android), import the Quest SDK, import your project files, set the shaders provided by the SDK and upload it. You can upload using the same blueprint ID as your PC avatars to have them gracefully fall back to Quest version for when Questies see them but your armature apparently has to be the same as on the PC avatar. It's was surprisingly painless effort when I last uploaded some.