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In this guide, you will learn the basic concepts of the file upload architecture in CKEditor 5 WYSIWYG editor which will help you implement your custom upload adapter. While this guide is mainly focused on image upload (the most common kind of upload), the presented concepts and the API allow development of all sorts of file upload adapters for different file types like PDF files, movies, etc. In this guide, you will learn the basic concepts of the file upload architecture in CKEditor 5 WYSIWYG editor which will help you implement your custom upload adapter. While this guide is mainly focused on image upload (the most common kind of upload), the presented concepts and the API allow development of all sorts of file upload adapters for different file types like PDF files, movies, etc. In this guide, you will learn the basic concepts of the file upload architecture in CKEditor 5 WYSIWYG editor which will help you implement your custom upload adapter. While this guide is mainly focused on image upload (the most common kind of upload), the presented concepts and the API allow development of all sorts of file upload adapters for different file types like PDF files, movies, etc. In this guide, you will learn the basic concepts of the file upload architecture in CKEditor 5 WYSIWYG editor which will help you implement your custom upload adapter.