Question
The "Set Matte" effect disappears after a while. It does not appear in the effect list.
I can find the "Set Matte" effect in the effect list in a project I just opened, and I even use it. But after a while of dealing with the project, this effect disappears in the list and I cannot use it again. I don't know how this happens, but when I search the effect list, this effect definitely does not appear. Please help.
