I have worked since 2014 with Camtasia Studio and have paid some hundred USD. I have respect for your work, but I find it very hard to understand 'add effect'. It seems very primitive way for the coder and very odd for the user. I have tested Zoom. I have seen the video, but I cannot figure out how to add an effect at one time and make it stop at another time. It is VERY complictated compare with Camtasia and probably other software.
I see the timeline in the popup window - It took me some time to see that. I want some symbols ON the media on the timeline. I want to be able to drag them on the media etc. If I understand it correct. Your User Interface is too odd and you can NOT attract buyers with this.
PS I use the paid version.