Please see previous discussion here.
When a user clicks the button to download a Send from a browser, they potentially have to wait a very long time until the browser reacts. The download button spins but there is no other sign of activity, leading many users to assume the download is not working and then contact me for support. This is especially problematic on slow Internet connections or for large files, which might involve a long wait.
I understand there are probably reasons (in-memory decryption, perhaps?) that the browser cannot react until the file is fully downloaded, but a progress bar would go a long way to reassuring users that the download is proceeding, and generally improve UX on the receiver side.
Thanks