Hey everyone, I'm making this since it's been asked and seems like it will continue to be asked forever.
"My music/images won't show up in the editor, what do I do?"
Make sure they are in the right format (see below).
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INTERSECT ENGINE FORMATS:
Music: Your music files must be .ogg
Sounds: Your sound files must be .wav
Images: All images/sprites/paperdolls ect.. must be .png
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Simple once you know, but many don't.
Have fun making games!