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download_media_to_file took &mut std::fs::File and wrote every network chunk with a sync write_all on the executor thread — for a ugoira frame zip (up to 512 MiB) that is the whole download stalling a runtime worker, while bsky's remux had already been moved to tokio::fs for exactly this reason (its comment: a multi-megabyte std::fs::write blocks the executor thread). The signature takes &mut tokio::fs::File now; the single caller (pixiv's ugoira path) clones the NamedTempFile's handle — the clone shares the file offset, so the ZipArchive extraction in spawn_blocking reads what the download wrote — and drops it after the download hands the bytes to the OS.