What is Onebox refer by Kobotoolbox

Continuing the discussion from Inserting file into community forum post/reply:

As there is no way of attachment, external storage link is the way of file share.
Have any storage server recommend by kobo?

A one box is a feature of Discourse (the software running this community site). If you paste a link on a separate link, the software will go fetch some information about it. For example, pasting https://github.com/kobotoolbox/kpi will show like the below box:

Thanks a lot. :relaxed: