CKFinder is a file manager that seamlessly integrates with CKEditor 4 and CKEditor 5. It makes it easy to securely include files and images within content created with the editor. More information can be found on the CKFinder page where you can also test it and see its full potential. If you still have doubts you can download a free trial and test it directly on your site.
Our installation documentation for CKFinder is located in Quick Start Guide.