This simple plugin replaces the built-in image upload function. The plugin enables the developers use their own server to save the image without any file browser.
Update at 18 Oct 2017:
Example has been added in GitHub.
The recommended way to install all CKEditor add-ons is to create a custom build by using Online builder. To do that, click the Add to my editor button on the plugin page. When you are done, click the Build my editor button on the right side of the page to go to Online builder.
Note: This add-on is already selected to be a part of your current build.
Add-on installation instructions
If you want to add the plugin manually, you will need to:
Extract the downloaded plugin .zip into the plugins folder of your CKEditor installation. Example: