Comment (by Roland Haas):

Uploading the tarball (~230MB) can be tricky and Bitbucket tesnds to time out / report strange errors.

If the browser fails, one can try curl eg in my case (rhaas80 being my Bitbucket user name):

curl -u rhaas80:BITBUCKETPASSWORD -o /dev/stderr -X POST https://api.bitbucket.org/2.0/repositories/einsteintoolkit/www/downloads -F files=@$HOME/tmp/Kerr-Schild_Multipole-20200528.tar.gz

If you have enabled TFA for Bitbucket, then you can use an Application password with write permission to the repo. These can be created here: https://bitbucket.org/account/settings/app-passwords/

The curl syntax is documented: https://developer.atlassian.com/bitbucket/api/2/reference/resource/repositories/{workspace}/{repo_slug}/downloads#post

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2174/test-multi-patch-scalar-wave-equation