Hello Loulabee,
Welcome to the
AudioDirector forum

, & welcome back to PDR.
Jeff is 100% correct. The options for saving are different when you use Wave Editor via PDR compared to using it as a standalone application.
When you select Edit Audio > WaveEditor in PDR...
... your clip is oped in WE. after making your adjustments, you'll be prompted to Save...
... then a separate (adjusted) .wav file will be returned to PDR.
If you open WaveEditor as a standalone, import an audio clip & adjust it, you'll have the option to save it.
This is similar to how PDR & ADR interact in more contemporary versions.
PIX
PIX YouTube channel