Whenever I draw on a PDF it stops drawing the moment I lift my pen up
I have always been able to draw as much as I want on my PDF but recently whenever I lift tup my pen it reverts back to the selection tool.
For example if I want to draw a word: after I draw the first letter and lift up my pen I cannot keep drawing the rest of the letters of the word. It just selects the letter I have drawn and lets me move it or delete it.

