Apparently not, according to the release notes:
No matter which of these APIs you use to save data for a given user, the data will not be accessible while running as a different user. From your app’s point of view, each user is running on a completely separate device.
I hope I'm wrong because I have the same problem as you.
I appreciate that it would have been a potential security hole, but if I saved files in the folder returned by getExternalStoragePublicDirectory
, I would have only myself to blame.