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Answers and rating deltas for

How could I validate the insert button if the user did not choose a file to upload?

Author Votes Δ
Shailendra Madda 3 +0.52
Relsell 1 +1.72
ninad thakare 0 -2.97
Raman Sharma 0 -2.88
Last visited: Jul 10, 2018, 3:00:20 PM