useDownload

openDownload

The URL.revokeObjectURL does, as the name suggests, revoke the ObjectURL from the DOM. Meaning that the ObjectURL is no longer available. It is good practice to do so, because otherwise memory usage will build up. However, when the Download button is pressed in the PDF reader (of Chrome for example), the download will result in a "Network Error". That is why we now clean up after 30 minutes. We need to see if that is a good middle ground.

When the document is refreshed, the memory is also cleared.