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Big-file testing found single-PUT uploads 413 above the server's per-request cap (Apache LimitRequestBody / PHP post_max_size / proxy limits). NextcloudProvider now uploads files >chunkSize (100MB) via the dav/uploads chunked API: MKCOL a session, PUT N chunks, then MOVE .file onto the destination (atomic assemble). Bypasses any per-request cap so multi-GB files back up. Verified byte-exact (multi-chunk) against live Nextcloud. SFTP already streams; single-PUT path unchanged for <=100MB.