Public directories cannot be accessed on some Android 10 devices
This is an issue with Android's new scoped storage system. I'm not sure why, but it only manifests on certain devices. My Pixel 2 XL running Android 10 and all the devices I have tested in the Android Emulator running Android 10 do not have this problem, but a user with an Nokia 7.1 does have the issue.
It looks like a temporary workaround might be to set `android:requestLegacyExternalStorage="true"` in the manifest.
Long term I will need to figure out how to redesign file access for scoped storage.