The phrase "Internet Archive HTML5 Uploader 1.6.4" is a technical tag often found in the metadata of items uploaded to Archive.org
// Force legacy HTML5 Uploader v164 window.location.href = 'https://archive.org/upload/' + your_item_identifier + '?uploader=html5_164&priority=high'; internet archive html5 uploader 164 best
If you are uploading 1,000 files, do not send them all at once. Use the v164 approach: The phrase "Internet Archive HTML5 Uploader 1