Chromium 92 and later failed to download files if the ~/Downloads is a symlink to another file system (FS). Chromium spits message "Failed - Download error" and creates a Unconfirmed 56679.crdownload in ~/Downloads directory.
Apparently, Chromium-92 is able to write to the destination directory, but does not like it somehow.
How to repeat:
Using two file systems: /home and /data (or /tmp)
ln -s ~/xyz ~/Downloads # this works because Dest directory is on the same FS
ln -s /data/Downloads ~ # this makes Chromium downloading failed because Dest directory is crossing the file system; Chromium 78 and earlier version work well on across file system.
There are many things in bug 258679.
Unable to reproduce this. Can you give it a try as well?
The Chromium Version 99.0.4844.51 from FreeBSD 13.1-BETA2 does not show this problem.
Hopefully we will have a good release from then.