I am using a Lumia 535. My phone is not showing any custom ringtones in spite of adding some music clips to the ringtones folder.
I am using Windows Phone 8.1. Please help
Firstly, I would suggest you to try Ringtone Maker. It worked fine for me.
Now, if you are using any other file, just take care of these restrictions:
The file must be copied directly from a PC to the phone's Music or Ringtones folder. If your phone supports an SD card, then copy the file to the phone's root folder. Copying to the Ringtones folder on the SD card won't work.
Copy the file on a PC, right click mp3 file select "properties" select details tab at top, set(add/edit) genre as "ringtone"
move file to phone storage under "ringtones" folder
In Settings/Personalization/Sounds/Ringtone the file name is now in the list of ringtones
Note: it does not appear under "custom" for me its just in the list
You can use this method as I am using with my Lumia 535 effectively. This also works well for file sizes greater than 1MB.