Problem with different ringtones setting for each SIM and contact.

Hi,
Is it possible to set different ringtone for each SIM? I can not set it in any way. I found 2 apps in Play store named DualSim Ringtone, but both of them are not working - two sims ring the same as 2nd sim slot is set.
Also it is impossible to set different ringtone to separate contacts - there is no option "Set ringtone" in my phone as it is described in this article:
gottabemobile.com/2015/02/09/how-to-set-contact-ringtones-on-android

I tried settings with stock Rom 06.29 and now 08.07, not rooted.
Can someone tell me any solution? Thanks.

Where are the system notification and ringtones stored in Lollipop?

I got a Note 5 (Verizon) yesterday and am trying to locate the system directory where notification and and ringtones are stored..... I'll be danged if the "+" icon disappeared in both notification and ringtone section so I can't add any.....2 different Samsung people playing around in my phone weren't much help....I SHOULD be able to copy a file over and place it in a directory where it would be recognized....but searching for mp3 locates only the files copied over....the horrible news, I've got voice mails for ringtones..apparently smart switcher transferred them over.....I am so annoyed. Can someone have mercy and tell me how to manually install the sounds for both ringtones and notifications.....there is NO OPTION to add in system settings.....as it said earlier, there was a "+" at the bottom right to add new sounds.... I may have chosen "music" to where to add the ringtones.....TIA