Hello,
There is no possibility to import image (png, jpg) into interactive diagram editor in v.3.0
It works in 2.1 (although only in Chromium - the FF doesn't import it).
I have added image/jpeg type to the array because mimetype has been not recognized.
Debug now shows that mimetype is ok.
It is possible to import it into properties/media, but not the editor.
I've checked stable and develop version but there is no change.
System:
Ubuntu 14.04.3
PHP 5.5.9-1ubuntu4.11 (cli) (built: Jul 2 2015 15:23:08)
apache2.2
I'd really would like to install the newest version ... the HTML5 is very nice.
Best regards