Audirvana Studio 1.2 - local library not syncing

Again, syncing issues.

This time, Audirvana Studio 1.2. External SSD drive. The individual subfolders will sync, but if I try to add the main folder that contains the subfolders, Audirvana says “Syncing” and then stops. Nothing happens. Nothing loaded in the Audirvana library.

macOS Big Sur 11.4. 2018 i7 Mac mini, 32GB RAM.