Stereo & Mono Files

https://forums.adobe.com/people/Amar+Khan  wrote so I recorded a vocal file, opened into Audition, extracted to mono. Got rid of the .wav and the .R file, which left me with the .L file, after editing etc, I apple dropped this file to my phone. When I listen to the file on my phone with earphones, it only comes out of one speaker? (have tried on multiple headphones etc.) Any ideas what has happened? the transfer has changed the mono file back to stereo?

At no point have you saved a mono file! You can't 'get rid of' a wav file - that's the file format, and if you started with a stereo one, that's what you will retain - just getting rid of one channel of the audio doesn't make it mono, I'm afraid.

To do this correctly with a stereo file: go to Edit>Convert Sample Type and select Mono in the Channels section, with a mix of 50% of both channels. You can leave everything else alone. When you click on OK, your file will be converted to mono, and then all you have to do is save it.