Should also have the possibility to download And preview files like on shareonline.vg

It seems you are looking for a way to implement downloading and previewing files similar to what is offered by shareonline.vg. To achieve this functionality, you would typically need to consider several components, which can be implemented using web development technologies. Here’s a general overview of how to create a system with these features:

### Key Components:

1. **File Upload**: 
   - Use a back-end server to handle file uploads. You could use technologies like Node.js, Python (Flask/Django), PHP, etc.
   - Store the files on the server or integrate cloud storage solutions (e.g., AWS S3, Google Cloud Storage).

2. **File Preview**:
   - For certain file types (e.g., images, PDFs, videos), you can generate a preview directly on your website.
   - Utilize HTML5 `<video>` and `<audio>` elements for media files, and `<iframe>` for documents (like PDF).

3. **Download Functionality**:
   - Provide a button or link that triggers a download of the file. This can be achieved with a simple anchor (`<a>`) tag pointing to the file’s URL and using the `download` attribute.

4. **User Interface**:
   - Create a front-end interface using HTML/CSS/JavaScript. Frameworks like React, Vue, or plain JavaScript can help in building dynamic user experiences.

5. **Authentication and Authorization**:
   - Implement user authentication (sign-up/login) if you want to restrict access to files.
   - Ensure appropriate permissions are set for file access and downloading.

6. **File Management**:
   - Create an admin or user dashboard for managing files (viewing, deleting, organizing).
   
### Sample Implementation Outline:

#### 1. Backend (Node.js Example):
```javascript
const express = require('express');
const multer = require('multer');
const path = require('path');
const app = express();

// Set up storage engine
const storage = multer.diskStorage({
  destination: './uploads/',
  filename: (req, file, cb) => {
    cb(null, file.fieldname + '-' + Date.now() + path.extname(file.originalname));
  }
});

// Init upload
const upload = multer({
  storage: storage
}).single('file');

// Endpoint for file upload
app.post('/upload', (req, res) => {
  upload(req, res, (err) => {
    if (err) {
      res.status(500).send(err);
    }
    res.send('File uploaded!');
  });
});
```

#### 2. Frontend (HTML Example):
```html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>File Upload</title>
</head>
<body>
    <h1>Upload a file</h1>
    <form action="/upload" method="POST" enctype="multipart/form-data">
        <input type="file" name="file" required>
        <button type="submit">Upload</button>
    </form>

    <h2>Preview</h2>
    <iframe src="path/to/your/file.pdf" width="600" height="400"></iframe>
    <a href="path/to/your/file.pdf" download>Download PDF</a>
</body>
</html>
```

### Considerations:
- **Security**: Ensure that the application is secure to prevent unauthorized access and vulnerabilities (like file type validation).
- **Scalability**: If you expect high traffic, consider using a scalable architecture to handle many users simultaneously.
- **Responsive Design**: Make sure the interface is user-friendly on both desktop and mobile devices.

By following these guidelines, you can set up a feature-rich system for file downloading and previewing that similar platforms like shareonline.vg offer.