BigCinCA, thanks! I ended up just using it as is. Now one more question:
In SolidExplorer, I can't write to the SD card. Previously on my Note 4, trying to do so would trigger a prompt asking me to grant permission to the SD card for the app. But for some reason, I'm not seeing that, so I can't figure out a way to give that permission. The built-in Files app works, so I don't think it's a problem with the card.
Anyone have an idea how I can do this? Or is it a problem with SolidExplorer, maybe it's not recognizing Oreo correctly?