Adobe Audition Mixer Automation Write Help

Hey guys I'm fairly new to Adobe Audition and am having problems with the mixer panel. When I use the mixer and click on one of the tracks to write, it doesn't edit anything. After moving the fader to edit and playing the track back from the beginning, the fader doesn't move to show the edits I tried making and no key frames are added. I'm really confused why this is happening and tried looking up a solution online but haven't found anything. Any help would be greatly appreciated.