Could you please provide more details into what you're trying to download (is that a video or other type of document)? Also, any details about your environment could help (what is the browser type/version that you use, what OS, etc).
Thanks a lot, providing more details here could help us pinpoint a solution. Please also refer to this page for details around what system requirements are recommended.
I've looked into this and have been informed by the team that this was an issue today which unfortunately affected the download service. This has persisted for approximately 1 hour today before getting solved, so you should be able now to export.
Could you please retry downloading your assets and see if it succeeds?
Thanks a lot, we're very sorry for the inconveniences! Madalin