Audio source url link

How do I know the URL link for an audio file?
When going into the alexa development console and look at the json output console, it looks like this: https://s3.amazonaws.com/com.getstoryflow.audio.production/1584328997898-tehm_003.mp3
But in Voiceflow Speech Block it is difficult to batch with API because some of the following characters are missing: https://s3.amazonaws.com/com.getstoryflow.audio.production/tehm_003.mp3

Changing file properties with audacity app and uploading audio files using Amazon s3 resolves the problem. I’ve been doing voiceflow with programming beginners, and I’ve learned a lot in a month and a half. Thank you for your help, voiceflow officials.