I forgot to mention, you can also normalise the audio piece with Audacity in case the volume level is relatively low. Normalisation is increasing the volume level up to the highest "safe" level with the loudest part of the audio section kept in the safe area without distortion or clicking. There's also other filters you can use, but you should always keep a backup of the original just in case of errors. At least then if you make a mistake you can start again whilst still keeping a backup.

This is not important though & should only be applied in exceptional circumstances.

I use an audio program where I can set the maximum % of normalisation (eg: 80%.) I find that's safer whereas most audio programs can only offer the 100% mark of normalisation.