After you sign into your account
"File" is on the left side-bar under "Review"
(see screenshot below)
If you still can't find it, sign out of the account
Sign back in, and on the very first page, scroll down and Click "Your Tax Returns and Documents"
(See screenshot #2)
Click "Add a state" (you aren't going to) in order to open the return
File should be on the left side-bar
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