The vertical position can be controlled by low, middle or high because top31. August 2016 um 09:59
I have never noticed the setup \setupfloatcaption before, but I think
you have to add a top/middle/bottom or so to the outermargin, like
\setupfloatcaption is the internal command to change the layout of the caption\setupfloatcaption[figure][location={outermargin,middle}]
\starttext
\placefigure
[top]
{The famous dutch cow!}
{\externalfigure[cow]}
\stoptext
Another option might be to use \setupcaption (somebody could perhaps
tell the difference between \setupfloatcaption and \setupcaption?)