Hello, 2 questionss here>is it possible or is there a way to convert all object s outlines in all frames to fills at once and not frame by frame? and why sometimes erases the outline instead of converting it to fill?

Hello, 2 questionss here>is it possible or is there a way to convert all object s outlines in all frames to fills at once and not frame by frame? and why sometimes erases the outline instead of converting it to fill?