GO barrel roll directions

I'm stumped on the barrel roll process in the iOS app

This is either really poorly explained here and here, or my app does not do what you are suggesting in these 2 posts:

* https://www.insta360.com/support/supportcourse?post_id=13472

* https://forums.insta360.com/section/16/post/1352/

Step 1 is easy: （1）Connect to the Insta360 GO app, download the video and edit. Select the length of the video. Adjust the size and trim the length according to what you’d like.

Step 2 getsmore complicated:

"Long-press the screen until the gridline appears. Drag the screen to centre the horizon. Centre the horizon at the beginning, middle and end of your hyperlapse. Adjust the Roll axis to -180 degrees at the halfway point of your video."

When you say "Drag the screen to centre the horizon," the only way to do this seems to be in by dragging the degree marker until the image is straight. However, then you go on to say, "Centre the horizon at the beginning, middle and end of your hyperlapse." I guess that this means that you do the same thing in those 3 spots, but that seems repetitive.

When you say the following, you lose me: "Adjust the Roll axis to -180 degrees at the halfway point of your video." You just said to centre the horizon and now you want me to change the axis again?

Step 3 says, " Then, adjust the Roll axis to -360 degrees at the end of the video." This is very confusing.

Besides, these directions being hard to follow, this process gets me one long 5 minute barrel roll on a hyperlapse. I can't figure out how to insert barrel rolls in the middle.

Additioinally, even if I delete each barrel roll (click on yellow circel until it turns to an X and then click on it?), my barrel rolls is still there.

Are you missing a direction where one locks in the new centered horizons? And also some way to delete barrel roll start and stop without having to revert to default?

Thanks!