Upload audio file to Google Drive
via usb cable (This is possible with Chromebooks. Files can be moved directly to Google Drive.)
via SD card reader to Chromebook. I have not tried this yet.
Audacity was the choice before 1:1
We Video - online platform that links to Drive but we have limited licenses at the moment, but if demand increases that may change.
Adobe Podcast - new platform in Beta version. This may offer a new way forward. Take a look at the template of my project. You can take a closer look at it, manipulate it, or create your own based on it. It will not change my original project.