Good site, bad app

Coursera app (iPhone): Sorry, but this has a LOT of bugs. It does not accurately show my progress in the course, I could not access saved drafts of the assignment, I could not save a draft when I re-entered all the assignment information, and the "Submit" button was unresponsive. ...please fix. This is excruciating.

Arghhwhyyy about Coursera: Grow your career, v2.2.1