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Key Changes:-
Password Security: Password is now fetched securely from an environment variable or user input.
Exception Handling: Added error handling to catch SSH and SFTP connection errors.
Context Manager: Used context management (with statement) to handle connection opening and closing cleanly.
Logging: Added logging statements to track important actions such as starting upload, connection established/closed, and success/error messages.
Efficient Temporary File Handling: Temporary files are automatically cleaned up after use.