You can not create attachments as the issue is in a non-editable workflow state.

Manage Attachments OT-51

This page allows you to manage the attachments for a particular issue. Only users with administrative privileges to remove an issue can remove attachments.
    File Name Size Mime Type Date Attached Attached By  
1 File OO Huawei U2000 FRS 0.1.docx 139 kB application/vnd.openxmlformats-officedocument.wordprocessingml.document Azmat Ali
2 File OT INFO.csv 46 kB text/csv Azmat Ali
3 File OT Site Matching.xlsx 153 kB application/vnd.openxmlformats-officedocument.spreadsheetml.sheet Azmat Ali
4 File Site_Data_Information.xlsx 62 kB application/vnd.openxmlformats-officedocument.spreadsheetml.sheet Azmat Ali