Canvas allows you to add annotations to PDF files for assignment submissions. Available annotations include highlight, underline, squiggly, strikeout, free text, drawing, and image.
The images in this lesson are shown for a phone display, but unless otherwise noted, tablet displays mirror the same steps.
On the Dashboard, tap the name of the course you'd like to view.
On the toolbar you can manage your annotations.
To add highlight, underline, squiggle, or strikethrough annotations, tap and hold the Text Formatting icon .
To type text or add a comment, tap and hold the Free Text icon .
To add thin drawing, bold drawing, arrow, line, or shape annotations, tap and hold the Drawing icon .
To undo changes, tap the Undo icon .
To move the toolbar, tap and hold the drag handle , and move it to the new location. The toolbar can be relocated to either side of the screen.
Use Text Format Options
The Text Format option allows you to highlight , underline , squiggle , and strikethrough  text.
Tap the Submit Assignment button.
Select Assignment Details
Tap the Course link  and select the course from the list. Then, tap the Assignment link  and select the assignment title from the list.