I tried it. Looks great. Just few refinements from my side.

- Undo is not working. If you applied something it will be done. I had to reupload the pdf to again make the changes.

- I tried the text editing, it is having a defualt font family of `helvetica` and is automatically applied to the selected text once clicked and there is no way to undo or fix it.

Thanks for trying it!

In what scenario was undo not working? If you can provide that context, I can dig into it more as to what wasn't undoing properly.

For text editing, I see the issue with that for some of the fonts. Fixing now

Sorry for the trouble!