Well, the import button provides several ways to import different things, not only audio (just try it out to see the options).
Your way by the audio window is just adding audio files one by one.
The import function provides two ways for audio batch import. Either you put audio files with the same names to the sheets into the same folder and those can be batch imported.
Or you use the csv import with which you can import lots of sheets including metadata and audio in one go, but you have to prepare a specific csv file with the import data beforehand.
For the specific use of these features see the manual or the forum.
Your way by the audio window is just adding audio files one by one.
The import function provides two ways for audio batch import. Either you put audio files with the same names to the sheets into the same folder and those can be batch imported.
Or you use the csv import with which you can import lots of sheets including metadata and audio in one go, but you have to prepare a specific csv file with the import data beforehand.
For the specific use of these features see the manual or the forum.