I loved this plugin. It did exactly what it said. However the developer now made the very stupid move, to merge this plugins into another plugin called "Neilo Content".
If you still want to use the external images features, you now need to install Neilo Content plugin, which is a massive plugin that comes with tons of features such as Editorial Calendar, Social Networks, team capability, which are all unrelated to the external images feature. This is very silly, since all those features sound nice in theory, but you sure won't need it if you only want external images, not to mention the server load that is created by all these features and slows down your website unnecessarily. It's a massive bloatware plugin that comes with heavy advertisement for the pro version
The only reason the developer discontinued and merged this plugin, was to promote his new plugin, which is bloatware and he advertises as free, but once installed, you are being prompted to upgrade to the Pro version.
Once again a developer on WordPress, who had a great open source product, but decided to throw it all away for a lousy promotion of his paid products.
The solution would have been simple, keep this plugin alive, and promote your paid plugin.
Anyway, this used to be a 5 star plugin, but now deserves a 1 star rating for this bad move.