DYNAMIC LINK Between Excel Template and PowerPoint Template

NEED:
-Excel Template (Fillable)
-PowerPoint Template (Linked to that Excel Template)


-Both open "fresh" every time they are needed.
-User will open both, they will fill in the required fields within the Excel template, the PowerPoint Template will update, and then the user will either send the PP Presentation for use or print the PowerPoint Presentation for use.

*I have created a very large, multi-sheet Excel Template that is designed to have a User open the template, complete the required fields based on the specific client, and then be able to generate reports. Initially I had handmade the reports in Excel and they work fine, but for the sake of it, visually not being the most attractive thing in the world, I've now created a PowerPoint Template which has taken the visuals full circle, however I am having an issue with the linking.

**Here is the process I have been using, which is not working: Copy a range of cells within the Excel template < Open the PowerPoint < "Paste Special" < Paste Link < Select Excel

PLEASE let me know if anyone has any expertise on this, the Links are not only not updating after pasting a few more links, but then when I close and re-open, they do not update at all. No idea what I am doing wrong.

I am saving them to one drive/autosave. Not sure if that has an impact?