Add slide of read-only presentation

[SungwonShin]

I want to add a slide in PPT that is read-only, add sentences to that slide and save the file.
However, the slide is not added, so the sentences I added are overwritten as is on the existing first page.
Is there any way to fix this?
(I have no choice but to load the read-only PPT)

This is my code :

//myppt.pptx : read-only ppt
presentation.loadFromFile("myppt.pptx");
presentation.getSlides().insert(0);
// Not inserted slide

[William.Zhang]

Hello,

Thanks for your inquiry.
To help us investigate your issue more accurately, please provide us with your input PPT file and full testing code. Additionally, could you provide some screenshots to describe your requirements? You can attach them here or send them to us via email(support@e-iceblue.com). Thank you in advance.

Sincerely,
William
E-iceblue support team