https://learn.microsoft.com/en-us/dotnet/api/microsoft.mixedreality.toolkit.input.imixedrealityinputhandler.oninputdown?view=mixed-reality-toolkit-unity-2020-dotnet-2.8.0
IMixedRealityInputHandler.OnInputDown(InputEventData) Method (Microsoft.MixedReality.Toolkit.Input)...
Input Down updates from Interactions, Keys, or any other simple input.
methodmicrosoftmixedrealitytoolkitinput