Pixelstreaming --- How to capture mouse clicks in client browser (UE5.3)

Hi, how can I capture mouse clicks in the Pixelstreaming client browser?
After deploying to AWS, the mouse cursor is visible and I can rotate the view with the mouse, but I cannot interact with the widget or mouse click event.
Do I need to make any changes to the mouse settings in the Pixelstreaming plugin?
Any advice would be appreciated.
Thanks!