Waiting to be removed.
Projects have a limit of 200MB of disk space in the container. The contents of your project’s ‘/tmp’ directory currently don’t count towards that total, but those files are removed when the project restarts. By default your Node.js modules don’t count towards that total - there’s a separate 1GB limit for node modules. Plus, there’s an additional 512MB of assets storage space.
It would seem that the storage for assets is separate, and you have 512MB for assets that is not counted in the project’s space