Check logs for any error.

Can you check if the file exists here:/content/dam/my-project/folder/audio/file.mp3 Also, see if the below URL is blocked in AEM as Cloud Publish: https://publish-pXXXX-XXX.adobeaemcloud.com/content/dam/my-project/folder/audio/file.mp3 

Can you share more details like Java, maven archetype, and maven versions?

Can you provide AEM version in which you are facing this issue?

You can talk to your IT Team to provide a proxy for downloading Adobe git repo.This is followed by most of the company for security purpose.

Can you check CDN caching rule for your site?

You should configure the code structure outlined by Adobe for AEM as a Cloud pipeline. Another solution is to push code in your repo and use a build tool for packaging your code to Adobe's recommended code structure in the AEM cloud repo.

you need to check errors in aem as cloud?

Can you provide the error details?

Please provide the snippet of the error you are facing.