I would like a "button" which I could "click on" that would on first click insert a specific photo from a windows file and then, on second click, remove the photo. It could also be two buttons. Or some other scheme. Any thoughts?

img = Nothing;
   img = Nothing,
   f = SystemDialogInput["FileOpen"];
   img = Import[f]];
 Method -> "Queued"]
Dynamic[If[ImageQ@img, img]]

This button will check if img is an image, if not it will call the file dialog, import the selected file, and display it - you could change f to a fixed filepath if you don't want the dialog. The Method parameter is set to "Queued" to allow the dialog. If img is an image it will reinitialize img to Nothing.

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  • 2
    $\begingroup$ Also you may want to use SystemDialogInput["FileOpen", {"Data", {"Data" -> {"*.png","*.jpg", "*.jpeg"}}}] to limit the file picker to images. $\endgroup$ – flinty May 26 at 17:08
  • $\begingroup$ Thank you very much. I will try it. $\endgroup$ – Peter Zug May 26 at 18:36

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