Steps to Reproduce
Go to /incident.do to display the new Incident form without the navigation pane being displayed.
Click the attachment icon and add a large file (for example, a .pdf, .jpg, or .png file).
You might not be able to reproduce the issue using a .txt file.
After attaching the attachment, click in any string field, for example, Short Description.
The field becomes responsive if you clicks the X that appears when you click on the field or click Save.
Note that you cannot edit the Short Description field after uploading the attachment.
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Related Problem: PRB1160950