Hi Andre, 

Welcome to Box Community and glad to assist! 

What you've experienced wasn't an error regarding your available free space but your upload size limit. 

The maximum file size limit for uploads to Box varies depending on your account type:

• Free personal: 250 MB


• Starter: 2 GB


• Business: 5 GB


• Business Plus: 15 GB


• Enterprise (and Digital Suites ): 50 GB


• Enterprise Plus: 150 GB

You can only upload individual files within your account type's limitation. For more details, you may visit this article. 

Thanks for posting! 

I understand now. Thank you!! xx