This feels like a permissions thing

Running Radarr 6.4.4.10685 on MacOS 26.4 (Tahoe)

When I add a request, I have two drive options to choose from: Alpha and Bravo. They are roughly the same amount of total storage and available space.

When I choose Alpha, I can see it complete in the NZB, but it still doesn't show up in Radarr. Then I noticed the Activity queue filling up with these recent file additions. It's rare, but it has happened, and simply manually importing them has fixed it. Now it's looking like everything assigned to Alpha has been stopped in the queue and says "failed to import" but there's no obvious reason. When I go into the media page and choose Manage Files, I get an invalid argument with the folder path. I realize it's because the path does not exist because it did not create the folder. If I go into Edit on that media page, it allows me to update the path to BRAVO. Then a pop-up asks if I want to move the files. I click yes, go back to the activity queue, hit manual import, and Bob is now your mother's brother.

So why, out of the blue, is Alpha not creating folders? And how do I fix it?