Github user tbouron commented on the pull request:
https://github.com/apache/brooklyn-ui/pull/24#issuecomment-206447871
The drag & drop feature is provided by CodeMirror. I'm not sure it can be
customised, I'll need to check that.
That being said, the content of the file is inserted where your cursor /
mouse cursor drop the file, so having a classic overlay "drop file here" won't
work here.
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