Suggestion: Get rid of the XML copy-paste window entirely and just add it to
the list of all the other file types that are already supported for dragging
and dropping.
Other sites allow for XML files to be drag and dropped into their upload section
without needing the code to be copy-pasted. There are a lot of first-time custom
builders wanting to use the BL platform getting hung-up on this feature. As someone
who runs a webstore selling MOC instructions I can tell you this is by far the
most common question I get.