How do I undo the annotations I made to my file?

You can undo your annotations only if you have

1. Have not saved the file
2. Have saved the file but by selecting Embed annotations option in the Save options.
   
   

Quick Steps to undo:

1. Press and hold on the annotated part
2. Choose Delete icon on pop up menu.
   
   

Note: If you have previously saved your file as Flattened annotations, you may not undo the previous annotation.