Hey @Mustafa, 
Thanks for the question! I think the issue you’re running into with SearchNext / Search not working properly in presentations (slides) is related to the same limitation that’s been discussed in these threads:
- OfficeApi's Paragraph throwing an exception when calling Search function
- OfficeApi's Paragraph throwing an exception when calling Search function - #7 by monkeycoder
Does this sound like the same problem you’re seeing, or is it something slightly different? If it’s not exactly the same, could you share a bit more detail (e.g., the exact API call you’re using, any error messages, or a minimal code snippet)?