When you first add the clips to your timeline do they show a red line above them? If so your project setting does not match your clip. You will know if you have the correct setting because at first there should not be any line above the clips.
As you edit your clips they will show a red line above them. To get a smoother preview you can render them by pressing [Enter]. They do not have to be rendered though - it will only affect previews, when you Share your project the whole timeline is rendered regardless of the state of lines above the timeline.
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Thank you very much for the response Nealeh. Yes, the clips do have a red line above them and when I render them (press Enter) the red lines go away. What's the easiest way to check and be sure the project settings match the video settings? Thank you so much for your help.
As Neale says, the easiest way to see if the project settings match your video is to drag a video clip to your timeline. If the project settings match the video, there will NOT be red lines above the clips until you add a transition or effect to them.
Is that he case in your project?
I completely understand and I thank both you and Neale for your responses.