My understanding was if you grab an existing ST3 stereo audio file from the ST3 folder and modify it you can then just import it back to the ST3 folder and all it does it updates the original and all data is preserved, as long as you keep its original name.
If you have modified the audio by changing its length or pitch then your data will be wrong and you have to correct it.
NOW I COULD BE WRONG AS THINGS ARE ALWAYS CHANGING BUT TRY AN EXPERIMENT AND SEE, it seems to work for me to what I want, it’s not ideal but it’s ok.
Perhaps Peter can explain better and more accurately.