Upload an audio file to a temporary storage before creating an animation.
The audio is uploaded using multipart/form-data. the filename directive is optional and if provided should contain up to 50 valid characters long.
The resulting file is stored as a .wav file in a 16kHz sample rate.
Valid characters: a-z A-Z 0-9 . _ -
Supported mime types: "audio/, video/"
Storage duration: 24-48H