I'm using Synapse 3 with the Naga Trinity mouse, and I'm mapping back and forward to "Alt-Left" and Alt-Right" to my Mouse 4 and Mouse 5 buttons. But it's not working in my browsers. If I do Alt-Left on my keyboard it works, so why isn't the button mapping working? I've tried it on both Chrome and Edge.
Synapse 3
Naga Trinity mouse
Windows 10, 1909
![](https://uploads-us-west-2.insided.com/razer-us/attachment/535363_dd27d5e52edd4d5242b72c04e7d7f9dc.png)