Android - Custom Alarm tone in 5.1

This worked for my 5.0:

• Stored the files in the Alarms folder (don't think this will be necessary)
• Go to file with ES Explorer (or other file explorer)
• Play the file with the built in media player of ES
• Tap on settings
• Set as ringtone and choose Alarm
• Go to Clock > Alarms and use your new music file as wake up alarm

Probably there is a option (just once/always) for choosing a ringtone in the Alarm menu. I think, I clicked on always by accident. (clearing cache/setting did not worked out) But this will be a pretty simple work around ;)