OS5 Android file backup location

We have a MyCloud Ex2 Ultra now updated OS5 and a couple of Android phones using mobile OS5, how can you choose where photos backup too?

The problem I have is the 2 phones are the same model so the auto selected folder name for backups is the same and it wants to drop both sets of photos in the same folder.
I can see on the phone the photos will backup to our public folder but there doesn’t seem to be any way of drilling down into or making a sub-folder with a individual name.

@grizzly.gra the only way to resolve this issue would be to create a separate share and give the user READ/WRITE access to both shares.

PhoneA → ShareA/name of phone
PhoneB → ShareB/name of phone