10/09/2014 at 7:41 pm #306672
That is a third party library Connections no longers uses. It is only provided for backward compatibility and will be removed in later versions. Currently Connections uses core WP functions to handle uploads. Many of the same functions the media manager uses.
What I can do is check the fill size before upload by, maybe doing it the same way as core WP does.
Right now I’ve put scheduled this to be in the next release.