Spotlight subject with circle effect and track

01. Just click the toggle keyframe once to create the first keyframe, then move in the timeline and change

the position value of the circle, it will create another keyframe automatically, keep changing only the position

value as you move through the timeline without clicking anything in the effects controls, (it seems you are

clicking the 'Reset Parameter' icon that's resetting your position to its initial value). It is normal to have blue

dotted lines while creating motion, this is your Motion Path.

02. Try also applying a 'Transform' effect, and wok on the position from there

03. You can also duplicate your video by holding 'ALT' while dragging a copy move it above your first video,

then on the duplicate above create an Ellipse Mask from the 'Opacity' parameter in the Effect Controls panel,

drag you ellipse or circle (hold shift if you want a circle mask), then go to 'Color' which will create a Lumetri,

adjust the highlighting from there (Exposure, highlights etc ....) then click on 'Track Selected Mask Forward'

in the opacity mask parameter in the effect controls, it will automatically track your subject, the highest the

quality and lighting of your video, the better the result.

Let me know if you need more explanations to prepare a short video

Keframes need to be set to Linear.

Set first and last keyframe first.

Then add keyframes where the mask goes off startings somewhere in the middle and so on.

Also if you have other effects nest first.