I cannot upload my audio files (mp3) after 8 files was uploaded.
Are you using a basic or a pro account?
If you have a pro account there’s no limit to uploads. But for a basic account, there’s an upload limit of 10 external files maximum.
So if you can only upload 8 audio files, it’s likely you have 2 other external files in the CoSpace already and reached the limit (if you only have a basic account). But if you have a Pro account this shouldn’t be the case.
If you have a pro account can you please share it with us here so we can look at it for you 