After completing the editing task, if you need a output final file, then go to FILE from menubar and select EXPORT option and the select file format as MP3 and click export.
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You can also save as project to continue the edits, for this go to FILE from menu bar and select SAVE .
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You can also save as project to continue the edits, for this go to FILE from menu bar and select SAVE . It will save in .aup format. Again you can open with Audacity and can continue the editing work.