"Download Source Tarball" is confusing on download page
The whole download page is tailored to Tor Browser. "Download in another language" for example is opening just a new site where one can download localized Tor Browser bundles.
It's confusing that "Download Source Tarball" is suddenly giving a link to the Tor source code then. We should at least be a bit more explicit and write "Download Tor Source Tarball" if we want to have that one a download page that is essentially only for Tor Browser. Otherwise one is expecting the Tor Browser source tarball (which is nothing we offer right now).
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information