Hola All,
A colleague just picked up that S3 + Boto does not handle multipart uploads. The following issue seems to indicate that there was a discussion on the mailing list, but I cannot see it:
https://github.com/ansible/ansible/issues/5442#issuecomment-297704581
Is this perhaps something that can now be revisited? It has several years since the issue was initially reported.
Cheers!