Uploading a project to code block with audio

Hi,

I have created code for an activity that includes audio. After I updated the HTML and rezipped the files, the zip file will not upload. I've noticed if my file is correct, the files upload quickly and I get a preview right away.

Is there some sort of tool I can use to troubleshoot? The only thing available to me right now is CoPilot, and I use it to vibe code.