SharePoint hosted Apps are limited to, use JavaScript or Jquery only. In some cases you like to copy a file directly from a SharePoint hosted app to the host web. This works as long as the file is a simple text file just like a master page or display template.
In case you like to copy an image to the host web, this is not possible trough jQuery. The reason for that is that jQuery has only been capable reading text files but not binary files.
The copy will succeed, but the file will be unusable and destroyed.
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