Hi Jeong,
in your code you need to add braces after each external figure command:
{\externalfigure[dummy][]}{}
Works fine with ConTeXt ver: 2014.09.26 11:42 MKIV beta
Willi
On 29 sep. 2014, at 16:01, Jeong Dal <hak...@me.com> wrote:
> \useMPlibrary[dum]
> \starttext
> \startplacefigure[]
> {\startanimation[menu=yes]
> %{\startcombination[2*2]
> {\externalfigure[dummy][]}
> {\externalfigure[dummy][]}
> {\externalfigure[dummy][]}
> {\externalfigure[dummy][]}
> %\stopcombination}
> \stopanimation}
> \stopplacefigure
> \stoptext
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