Generally I never use the default screen capture as you also need an image editor, see below.
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- When you click the Reply button, there is an Attachments and other options link, this expands the options to attach a file, that can be an image file or a text file (.log or .txt), see image below (click to expand).
- When you click the Reply button, there is an Additional Options link, this expands the options to attach a file, that can be an image file or a text file (.log or .txt).
- How to create the screen capture to attach, when the window that you want to capture is the active one, press the Alt key plus the Prt Scr (print screen) key together. That captures the active window (not the whole screen) and copies it into the clipboard.
- If you have an image editing application you can use that to save the clipboard copy to an image (.gif, .jpg or .png image format). If you don't have an image editing application you can use windows paint it is basic but should serve the purpose.