Simple mp3 hosting backend that will host .mp3 files for you for 5 minutes.
Make a POST request to https://url.com/upload with the mp3 file named as file with the Content-Type of multipart/form-data, it will return the link where its hosted for example https://url.com/uploads/13413efqef2ef2efef.mp3.
After that you make a GET request to https://url.com/uploads/13413efqef2ef2efef.mp3 and get the mp3 audio file.