If you took a picture of your W2 in the mobile App you can not get a copy of it. The picture is only to enter it into Turbo Tax. You need your own copy of the W2. See note on step 7 on this....
https://ttlc.intuit.com/community/entering-importing/help/how-do-i-take-a-picture-of-my-w-2-in-turbo...
Turbo Tax doesn't have or keep copies of your W2. Only the info that was entered from them. You need to keep your own copy or ask the employer for another one.
