"Supabase Storage Chunked Upload Flutter: Video Guide"
"Supabase storage chunked upload Flutter guide: resumable TUS uploads with progress, compression, thumbnails, signed-URL playback, RLS policies. Full code."
A user records a 200MB 4K video, hits upload, and the progress bar dies at 94% because they walked into an elevator. They try again. It dies at 61%. They delete your app. This is the reality of video uploads on mobile networks — and the fix is supabase storage chunked upload flutter : splitting big files into resumable chunks so an interrupted upload picks up where it stopped instead of starting over. In this tutorial you'll build the complete pipeline: a private bucket with RLS policies, resumable chunked uploads via the TUS protocol, a real progress bar, on-device compression so you don't pay to store 4K files nobody will watch, auto-generated thumbnails, and signed-URL playback with video_player . Everything is runnable Flutter 3.x + supabase_flutter 2.18.x code. Last updated: October 3, 2026 What you'll learn Why single-shot uploads fail for video (and where chunked uploads fit) Bucket setup + Storage RLS policies for private videos Resumable TUS uploads to Supabase Storage from Dart A real upload progress bar (the storage API doesn't expose one natively) On-device video compression before upload Generating and storing thumbnails Signed-URL playback with video_player Upload timeouts and retry strategy Supabase Storage Chunked Upload Flutter: How TUS Resumable Uploads Work Chunked upload means one idea: instead of sending the whole file in a single request, you split it into pieces and send them sequentially. If chunk 47 of 60 fails, you retry chunk 47 — not the whole 200MB. Supabase Storage exposes a TUS-compatible resumable upload endpoint ( /storage/v1/upload/resumable ). The TUS protocol works in three moves: Creation — POST to the endpoint with Upload-Length and metadata. The server returns an upload URL. Chunk upload — PATCH each chunk with…