Mixedrealitytoolkit-unity: OnInputDown not trigger when attach to the main camera

[Kent1LG]

Describe the bug

With the MRTK 2 RC2 i use to create IMixedRealityInputHandler script and attach it to the main camera. By this way i can trigger every InputDown.
When i do it with the MRTK 2.1 it's not working.

To reproduce

Steps to reproduce the behavior:

1 : Create a scipt using "IMixedRealityInputHandler".
2 : Configure the "OnInputUp"(Only on HoloLens 2 i guess) and "OnInputDown"
3 : Check if it trigger the AirTap

Expected behavior

Triggered every "OnInputDown"

Your Setup (please complete the following information)

• Unity Version 2018.4.9f1
• MRTK V2.1 (install by nugget)

Target Platform (please complete the following information)

• HoloLens
• HoloLens 2

[Troy-Ferrell]

@Kent1LG, you should look at registering a global input handler. See our documentation for how to achieve this

https://microsoft.github.io/MixedRealityToolkit-Unity/Documentation/Input/InputEvents.html#register-for-global-input-events