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Description of problem: Enter any run, click 'Add' of Attachment of a case, in this page the 'Back' button doesn't take effect. Version-Release number of selected component (if applicable): 3.8.5 How reproducible: 100% Steps to Reproduce: 1.Enter any run 2.Click 'Add' of Attachment of a case 3.Click 'Choose file' button, and select a file, submit. 4.Click 'Back' button. Actual results: 4.'Back' button doesn't take any effect. Expected results: 4.Cancel the selected file.