Can you check if you have 'Delete Attachment' permission ?
If you have, move the cursor on the screen shot, the delete button will be visible at the right-bottom corner.
You can also remove the attachments from 'Manage Attachments' option from the attachments tab.
If you have the "Delete Attachment" permission, you can find a little trash under the thumbnail representing the screenshot. It might appear only when you hover over the thumbnail.
The alternative is the manage attachments dialog. If you can delete a screenshot, a trash bin is shown at the right of the corresponding line in the table.
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