File Upload System

Build a full stack file upload system that allows users to upload and manage files through a clean modern interface. The application should support selecting files from the device, validating allowed file types, displaying upload progress, and showing uploaded files in a list. This challenge focuses on file handling, backend processing, validation, UI states, and basic file management workflows. You may use any programming language, framework, library, and storage solution.

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Project Requirements

Users must be able to open an upload modal or upload panel
Users must be able to select files from their device
The system must support file upload through a file picker
Users must be able to upload at least one file successfully
Allowed file types must be validated before upload
Invalid file types must show a clear error message
Uploaded files must be stored on the server or cloud storage
The UI must display upload progress
The UI must display uploaded files in a list
Users must be able to remove an uploaded file from the list
The interface must include loading, success, and error states
Basic validation must be implemented
The layout must be clean and user friendly

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