How to Build Honest Offline Recovery for Browser-Based File Uploads

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Browser-based upload pages often claim offline support, but a network is required to actually send media, and mobile platforms do not reliably retain selected files or run background tasks after a restart. A genuinely useful offline design treats each capability — shell caching, metadata persistence, chunk retry, and background continuation — as a separate, documented feature rather than a single blanket promise. Developers can use service workers to cache static assets and IndexedDB to store upload progress, while prompting users to reselect files after a full restart and verifying them by name, size, and modification time. Standard online/offline browser events are unreliable indicators of true connectivity, so uploads should pause after repeated failures and probe the server directly before resuming. A trustworthy implementation shows per-file status, reconciles committed parts with the server on reconnection, and never implies data has been sent when it has not.

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