A commonly-desired feature for a VRChat avatar is the ability to switch materials, so as to change color schemes and the like. This requires a nontrivial amount of setup, and with the standard approach it is difficult to maintain cross-platform compatibility. As a result, creators will usually only set it up on PC, leaving Quest users unable to see these customizations.
Here is my approach to setting up material switching in a way that’s easier to support on multiple platforms simultaneously. This particular method is what I developed for my critter avatar.