I think I know what you mean. You want to add handwritten notes/diagrams to already existing documents?
If so, when you pull out the stylus, you'll see the "air command" menu pop up, usually at the bottom right of the screen. If it doesn't, press the button on the S pen while hovering close to the screen and the menu will appear.
There is an option there called "Screen Write". Tap on that with your stylus and you can make handwritten notes on all sorts of documents.
Sorry for the misunderstanding. QPDF is a PDF reader and the intent of a PDF reader is not to convert proprietary formats to PDF. My recommendation for it was for annotating the PDF after it has been converted. It was my anticipation that you would have already had Hancom's powerpoint program, HShow, installed and we're able to open and save the pptx as a PDF.
For clarity, the workflow would be:
1. Launch HShow.
2. Open the powerpoint file.
3. Go to the File menu on the upper left corner and select Save As PDF.
4. Save the PDF file in a location that you can find it.
5. Exit out of HShow and launch your PDF reader program (like qPDF Notes).
6. Open the PDF you just saved.
7. Make your annotations/notes and save the file.
There's multiple worflows to do not taking so this isn't the only way. For example one could potentially import the PDF into a note taking application like Papyrus (I think you need a program called PDF view installed to do it) and then annotate on top of that.
If the powerpoint isn't too lengthy one could even flip through taking screenshots of each slide and then import each screenshot image into an S-notes notebook.
Part of the challenge (and fun) is finding a workflow that works for you.
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