Fix Gmail Login & Video Processing

I need assistance with a React and Node.js application. The app was written but no Readme or documentation is available aside from minor guidance. There are 4 tasks: 1. The project requires debugging the Gmail login issue: Error 400: redirect_uri_mismatch 2. Modifying the React code to: - Close a box when a specific task has been completed - Refreshing the page automatically after every action taken 3. Understand and fix a communication between two servers (FE/BE are on one server. The second server is an engine) 4. write a complete README including (but not limited to): - when a modification is done on the UI, what to do to implement changes - when the app is not responding (cannot login or page doesn't load or videos cannot be processed or ...): what to do