Instagram error 100: Video upload timed out or video is corrupted

Subcode 2018294 is the video-specific fetch failure, and it comes with a documented hard number: "if the video can't be fetched within 75 seconds, it will time out." When you send a video by URL, Meta must download the whole file inside that budget; a 25 MB video on slow hosting will not make it. The same subcode also covers files that download fine but cannot be processed - corrupted, truncated, or encoded in ways the platform cannot read despite a supported container extension.

The 75-second budget links size and hosting speed: it implies sustained throughput of roughly a third of a megabyte per second for a maximum-size file, which rules out cold object storage, throttled endpoints, and transcode-on-demand URLs. If images from the same host send fine but videos fail, this timeout is almost always why - images are small enough to squeak through slow hosting that videos cannot.

Pipeline video like a video platform would: normalize encoding on ingest, store on a CDN, and prefer attachment IDs over URL fetches for anything reused. Alert on send-time video failures separately from image failures, since their causes rarely overlap. Video format and the 25 MB ceiling are documented in the limits reference; generic fetch failures are 2018008 and size violations 2018109.