I think I have similar issue, but it is stuck on "calculating"
and nothing happens. For any site or file size. Issue appeared after the latest update. I've check permissions for Orion to access folders and re-selected folder where to download. I don't have any extensions in the browser.
Sequoia 15.3.1
Version 0.99.131-beta
Version 0.99.131-beta (WebKit 621.1.2.111.4) same issue on different websites today, where it worked before