Description:
We need to add a real example of file upload validation to our project documentation. This will help users better understand how to utilize the file validation functionality in our application.

Tasks:

1. Create a code example that demonstrates file upload validation.
2. Describe the checks performed during validation (file size, format, data type, etc.).
3. Add the code example to the appropriate section of the documentation.
4. Ensure the code example is clear and easily adaptable to different use cases.

Expected Result:
The documentation should include a section with a real example of file upload validation, providing a detailed description of the validation process and a code example. This will make it easier for users to understand and implement the validation functionality in their projects.