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Below is the sample code which I'm trying to use, which is react + TypeScript. onDragEnter and onDragOver are working properly but not the onDrop event.

import * as React from 'react';

export class FileZone extends React.Component {

  onDragOver = (e) => {
    let event = e as Event;
    event.stopPropagation();
  }

  onDragEnter = (e) => {
    let event = e as Event;
    event.stopPropagation();
  }

  onFileDrop = (e) => {
    let event = e as Event;
    event.stopPropagation();

    console.log("onFileDrop");
    alert("dropped")
  }

  render() {
    return (
      <div
        onDragEnter={this.onDragEnter}
        onDragOver={this.onDragOver}
        onDrop={this.onFileDrop}>
        Drag and drop file here
      </div>)
  }
}

Answers

Finally i got the issue, for some reason i have to handle the onDragOver like this :

onDragOver = (e) => {
let event = e as Event;
event.stopPropagation();
event.preventDefault();
}

this solved my issue.