I followed https://www.e-iceblue.com/Knowledgebase ... ument.html
to add slide numbers in powerpoint.
If I do as suggested in the tutorial I get instead of the slide number (the text is danish for slide number).
I have also tried to have the slide number visible from the beginning, but after editing through spire, the numbers are no longer responsive, meaning if I delete a slide, the slide numbers will not update to reflect this.
In my use case, I'm opening an existing powerpoint, not creating a new one.
I have attached a project demonstrating this. Run the project and select template, then select result to save.