v17.0 uses multiple parallel connections (default is 3). Your ISP or network may throttle parallel uploads. Solution: In your browser’s developer console (F12), check for archive.org/upload network activity. Try reducing concurrency: unofficially , you can run localStorage.setItem('upload_parallel_chunks', '1') in the console before starting.
: Occasionally, the automated system ("IA-indexer") can corrupt files or fail to generate previews (like .ia or .mp4 versions), requiring users to re-upload specific parts of a collection. internet archive html5 uploader 17 0