I thought that the figure would float through the text to the first location with sufficient space. That appears not te be the case: the input behind the figure does not typeset before it although there is ample space for the text that now follows the picture.

The code is roughly:

\setupcolumns[n=2]

\startcolumns

<several paragraphs>

\placefigure[][figuur:zw]{Street.}

{\externalfigure[zw][width=0.8\textwidth]}

\par

<small paragraph following picture>

<several paragraphs extending to next page>

\stopcolumns

How to get