Help for a magic prop

Hi guys I am working on a project (I do magic and make my own props) so I am after some sort of senser that I can mount in so a clip board or simmer where when some one draws or writes on the paper it will pick up what's on the paper and transfer it to a app I know how to do every thing els it's just the senser I am having issues with I no there is some thing out there but just can't find it any ideas or help please

You can buy "electronics clipboards" which use normal paper and a special pen.
They digitise anything drawn / written on them.

I have one, about 1cm thick and just a few buttons on an edge.
Possible add a WiFi SD card in place of a standard one & they could send everything to another machine or app as it's written or drawn?

An example - this one even has a bluetooth optio:
https://www.enablingtechnology.com/digimemo-electronic-note-taker-178-p.asp

Add a trim to hide the buttons & it should be something like what you need.

That's the sort of thing I am after but where any pen can be used I have seen the part I am
After weeks ago I just can't remember what I googled or where i saw it

You could possibly use a "resistive touchscreen" without any screen behind it, over or set in to a clipboard - that would work from pressure with a ballpoint pen.
You would have to create the interface and transmitter though.

eg.
https://www.ebay.co.uk/itm/8-9inch-...202620?hash=item3a89ee5afc:g:ONEAAOSwyP5aM4Rz

Or this is a 13" one which should be approximately normal paper size:
**broken link removed**

Will look in to that, I don't it that was what I had seen, thanks