How do I export a Timeline project?

How do I export a Timeline project? Actually, there’re only audio files in my project, so I want to turn the project into an mp3 file. However, every time I press “Export File”, only this appears…

Thanks!!!

Just type in a name plus the .mp3 extension.
eg: MyAudio.mp3

(It’s a good idea to enable extensions in Windows view options)

Thanks!!! It turned out that I didn’t wait for the conversion to complete last time…so only part of the project was converted into the mp3 file.

Thanks so much!