Unable to change ringtone - Issue

[styloxs45]

Dear moderator,
Need you help to fix my problem. I already do this a lot. restart phone and do again..still same not change at all. Below are short video about the issue

[Anders_ASUS]

Maybe it doesn't like the encoding used your MP3 files. Download one of these songs and try to set it as a ringtone
http://www.hochmuth.com/mp3-samples.htm