THIS IS NOT AN ISSUE: HACK to Paste Image directly from clipboard

First of all, thank you very much for your excellent work.

Prepare your server

2 routes :

• Updload image /upload/new (formdata with the attribut "image" is used in this present case)
  • server store image
  • response (json): {url: "[url to retrive image calling getImage], alt: "image name alternative"}
• get image /getImage/:imagename (for example)

UI

The process is as follows:

• copy the image to the clipboard
• focus on the markdown editor
• paste
• the manager tries to identify the context; if it is an image, it sends the image to the server
• the server returns the url from which the image can be accessed from the server
• the handler finishes by adding the context of the markdow : ![altname](url) image to the clipboard and the contents of the clipboard are pasted into the markdown editor
• the markdown editor is refreshed and renders the image by calling the provided url
• +++

With React, build your component

[...]

// Image upload to server
const imageUploadHandler = async (
    image: File
  ): Promise<{ alt: string; url: string } | null> => {
    if (image && image.size === 0) return null;
    const formData = new FormData();
    formData.append("image", image);
    //formData.append("what else you want", "your value");
    const response = await fetch('/upload/new', {
          method: 'POST',
          body: formData
        })
    return  (await response.json()) as { alt: string, url: string }
};

  const handlePaste = async (event: React.ClipboardEvent<HTMLDivElement>) => {
    // Access the clipboard data using event.clipboardData
    const clipboardData = event.clipboardData;
   // only if clipboard payload is file
    if (clipboardData.files.length === 1) {
      const myfile = clipboardData.files[0] as File;
     // you could perform some test: image size, type mime ....
      const url = await imageUploadHandler(myfile);
      event.preventDefault();
      if (url) {
       // change clipboard payload,
       // document execCommand is obsolete, you could replace with navigator.clipboard API but some browser
      // accept write() method only if the connexion is secure (https)...
        document.execCommand(
          "insertText",
          false,
          `![${url.alt}](${url.url})\n`
        );
      } else {
        document.execCommand(
          "insertText",
          false,
          "ERROR Image has not been stored on server"
        );
      }
    }
  };
 return (
    <div className={`MarkDownEditor`}>
      <MDEditor
       [...]
       // because the MDEditor interface is an extends of textarea props
       // you can use all the methods provided by this interface
      // e.g. add a method for dragging and dropping a file...
        onPaste={handlePaste}
       [...]
      />
    </div>
  );
[...]

Start with the MDEditor component and its onPaste handler, using the proposed clipboard and imageUploadHandler flow as the behavior reference. Implement image detection, upload through /upload/new, and insertion of the returned Markdown image, then verify that the editor renders the image from the returned URL.