...
To remove attachments from a page, go to the "Tools" menu page tools menu (ellipsis) in the upper-right hand corner of the Answers page and then select "Attachments."
The list of currently attached files will appear. In the right column of every attached file row is a link to change the properties of the attachment or remove it. Click on "Delete" to remove the attachment. A pop-up window will appear that will prompt you to select "Delete" again. Once you select "Delete" from this window, the attachment will be removed and disappear from the attachments list.
...