Misaki Thank you for your support!
No problem, I've recorded 7 videos with Spine boy project.
Here's the 1-5 screen recz. In it, you can see my steps: in 1st rec I've toggled the gun and also made DO keyframe, then started experimenting. Also, please pay attention to I offsetted with/ and without/ pressed ALT when dragging KFs.
Then, when playing around in 6 and 7 screen rec, I've found, that It's the top line of the dopesheet is the problem - if I don't select KFon it, then when I cancel, all the selected keyframes remain selected.
In the 7th recording I've restarted Spine (just in case) FYI: so there's no toggled attachment KF on the Gun and no DO KF.
