Click
Insert > Picture > From file in your PowerPoint
menu. Now click Browse in order to select your
default picture. If you don't have a default picture
that you can use, just insert an empty picture
with the correct dimensions with the same color
as your background.
Also note that it is best to always use images
of the same dimension as all images are stretched
to fit the first and initial image place holder.
At the Insert button you will get more options
to choose from after clicking the small arrow
in that button. Choose Link to file.

Click DataPoint > Linked object
properties to continue.
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