Depends on which mount you got with your Solo. If you got the package deal that included the gimbal which looks like this, then YES, it's a 3-axis system that can control most of the camera's functions:
However, the bare-bones Solo doesn't come with the gimbal which you have to buy separately. Instead, you get a plain GoPro mount that looks like this:
It doesn't do anything, and you can't control the camera from the app. It lets you plug in the HDMI cable, however, so you get a live video feed during flight, but the video recording (saved on the camera's SD card) will be shaky and not really very useful.