Cannot send audio files (mp3, wav, m4a) in iMessage

As a music artist, for months I've been able to easily text audio files to my contacts with some form of an Apple device, be it iPhone, MacBook, or iPod, but recently, anytime I try iMessaging an mp3 of one of my songs, the blue loading bar appears, but the file is never delivered. So I try sending it as a text message, but it doesn't send either. I thought it had to do with my service provider, but the files won't send on my MacBook Air either. I thought the files were corrupt so I exported new mp3's and wav files, and they won't send either. I'm not sure if this is due to an IOS and OS update. Please help :( I just want to share y music with my friends.