Multipart upload
Uploading a multi-gigabyte video file in one stream is fragile: a dropped connection means starting over, and a single stream rarely saturates the available bandwidth. Multipart upload breaks the file into parts, uploads each one separately, and lets storage stitch them back together. Parts can travel in parallel to use the full connection, and if one fails it is retried on its own rather than restarting the whole transfer.
This is the standard way to move large media to object storage. Each part can carry its own checksum so corruption is caught early, and the upload can pause and resume across sessions. For video teams pushing terabytes of rushes, multipart upload is what makes those transfers both fast and resilient.
Examples
- •A 40 GB R3D file uploads as parts in parallel to fill the connection
- •A failed part is retried alone instead of restarting a 40 GB upload
- •A large upload pauses overnight and resumes the next morning
In Sanbila
Sanbila uses multipart upload for files over 100 MB, so large originals reach Cloudflare R2 quickly and survive a dropped connection without restarting the whole transfer.
Frequently asked questions
How is Sanbila different from the proxy generator built into my NLE?+
Premiere Pro, DaVinci Resolve, Final Cut Pro and Avid all generate proxies locally, but they keep the original full-resolution files on the same SSD — so the disk fills up twice. Sanbila stores the originals in the cloud (Cloudflare R2) and keeps only the lightweight proxies on your machine. At export, Smart Relink streams the originals back via a local WebDAV mount, so you finish at full quality without ever downloading the source files.
Does Sanbila work offline?+
Yes for editing — once a proxy is cached on your SSD, you can cut, trim, color and arrange your timeline without an internet connection. You only need network access for the initial import (uploading originals to the cloud) and for the final export (streaming originals back via WebDAV).
How much cloud storage does the free plan include?+
The free plan includes 5 GB of cloud storage and one project, with no credit card required. Paid plans start at $49 per month for 2 TB and 50 projects, going up to 25 TB on the Enterprise plan with overage billing for teams that need more.
What upload speed do I need to use Sanbila?+
Any broadband connection works for the initial upload — Sanbila chunks files into 50 MB parts and uploads in parallel, so a typical 100 Mbps fiber line uploads 1 hour of 4K H.264 footage in about 6 minutes. After upload, day-to-day editing happens on local proxies, so your connection speed only matters again at export time when originals are streamed.
Which video formats does Sanbila support?+
Sanbila handles 22+ formats out of the box: MP4, MOV, MXF, R3D (RED RAW), BRAW (Blackmagic RAW), ARRI proxies, ProRes, DNxHR, DNxHD, H.264, H.265, plus WAV and AAC for audio. Both 4K and 8K sources are supported up to 200 GB per single file (URL imports have no size limit).
Related terms
Sources
- Multipart upload in Amazon S3 · Amazon Web Services
- Cloudflare R2 multipart upload · Cloudflare