Hi Edwin,
How should an external viewer open another picture, which isn't linked 
in the form? A macro will open the thumbnails.
Link the original fotos to the form. Then take this procedure:
SUB ShowLinkedContent(oEvent AS OBJECT)
        DIM oButton AS OBJECT, oForm AS OBJECT, oField AS OBJECT, oShell AS OBJECT
        DIM stField AS STRING, stUrl AS STRING, stContent AS STRING
        DIM arUrl_Start()
        oButton = oEvent.Source.Model
        stField = oButton.Tag
        oForm = oButton.Parent
        oField = oForm.getByName(stField)
        stUrl = oField.BoundField.getString
        arUrl_Start = split(oDoc.Parent.Url,oDoc.Parent.Title)
        oShell = createUnoService("com.sun.star.system.SystemShellExecute")
        stContent = convertToUrl(arUrl_Start(0) + stUrl)
        oShell.execute(stContent,,0)
END SUB
Write the name of the image control to the additional information of the 
button, which should start this procedure.
Regards
Robert
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Homepage: https://www.familiegrosskopf.de/robert
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