Finalize Web-Based File Sharing App

I need a web developer to finalize our file sharing application.

Essential functionalities include:
- Upload and download files
- File preview
- Sharing and transferring large files

We need support for multiple file formats, including:
- Documents (e.g., PDF, DOCX)
- Images (e.g., PNG, JPEG)
- Videos (e.g., MP4, MOV)

Ideal skills and experience:
- Proficiency in web development
- Experience with file transfer protocols and large file handling
- Strong knowledge of user authentication and security measures.

the app is mostly complete need a developer to finalize it and cross check our price list to make sure app contains all functions of the price list and they are working correctly

Looking forward to your proposals!