Before you paste, you should position the slider so that you see the frame that you want to appear immediately after the pasted data. When you paste, in most cases the copied movie frames are pasted immediately before the frame you see. The one exception is when the slider is at the very end of the movie, in which case the data is placed after the frame you see. Such data is given a default duration of two seconds when pasted. Images are resized and reproportioned to fit into the movie window's current dimensions.
Text is centered in the movie window.
If the text is too long the movie window's height is extended as much as possible on your current screen, and as much text as will fit in the window is visible. Select the section you want to remove. Choose Clear from the Edit menu. If you'd rather keep what's in the selection and get rid of everything else, you can use the trim function. Hold down the Option key and open the Edit menu.