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You should be able to insert as many sound files as you like into the timeline. Can you describe in more detail the problem that you are having?
I don´t know how to describe it. I can insert it, but when i play it, i can only hear one audio. should i try moving the short one on top of the long one?
Go to your Library window. You should see all of the audio files that you have imported into your movie. Select the one that won't play and tray to play it in the Library window. There's a small play button in the upper right of the preview window when you select the sound file. Does it play from that window?
If it doesn't play, it may not be a sound file that Flash can interpret. Open the Properties for that file and tell us what sort of file it is.