Own ringtones for contacts / system

Hello I got my p40 pro today and working around the system with no Google services so far love it – one annoying thing I can’t solve normally on an android device (always used Samsung ) I place mp3 ringtones in a folder called ringtone and they show in the ringtone section to add to contacts or phone ringer however not on the huewei any idea how I can get them to show or assign them to a contact ??