Drag and drop accepts batches, not just one file
The Upload Area is a drop zone that also opens a file picker when you click it. You can drop multiple audio files at once and the page will queue every one of them under "Sermons in This Batch". Each accepted file is checked against the supported formats (MP3, WAV, M4A, OGG, WEBM) and the 500 MB-per-file size limit before it appears in the list.
Once a file is queued, you can keep dropping more files and editing earlier rows. The list is your batch, and pressing the big upload button at the bottom uploads every pending item in sequence.