I am having trouble setting new DocumentPropertiesEx on powerpoint files using Slides.
basically, if this line returns null:
var properties = _presentationEx.DocumentProperties;
then no properties are added.
If it does return an object, my adds are successful.
here is the code i am using when that line returns null:
properties = new DocumentPropertiesEx();
properties[fileinfo] = toString;
where fileInfo and toString are both strings i have passed in
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