Before diving into the solutions, it helps to understand why your download might be getting stuck or failing entirely.

If you downloaded an MP3 file directly to your iPhone, you will quickly notice that iOS does not allow you to set MP3s as ringtones directly from your storage.

Launch the app and select the Audio Recorder tool.

Go to Settings > Sounds & Haptics > Ringtone and select your newly created tone. Safety Tips When Downloading Free Ringtones