Does anyone know why I can't add a fade to black effect to this clip? I don't understand why it won't do it :
You can only fade between two clips.
for fade to black in editor, use the tab Control (on the left), position the Play-marker (editor) on the fade-begin, Click on the roundbox (keyframe) of opacity100%, scrub the playmark to the end of clip and enter the value 0% at opacity.
Wrong, you can fade on a single clip as well. Zoom the timeline in a bit, drag the fade onto the upper half (!) of the video clip at the end.
I made a short sample demonstrating that:
Thanks for the help guys
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