Live Interactive Demo Model
Drag & Drop File Uploader
A file uploader supporting drag-and-drop with thumbnail previews and simulated upload progression bars.
Drag & drop files here, or browse
Supports PNG, JPG, WEBP, and PDF up to 5MB
Acceptance Criteria
Preventing default browser file-drop actions with onDragOver and onDrop
Generating secure blob URLs for local image previews
Managing multi-state upload queues with error boundaries
Target APIs & Concepts
Drag & Drop APIURL.createObjectURL()Progress Simulation
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