I was trying to upload [[ https://commons.wikimedia.org/w/index.php?title=Special:Upload&wpDestFile=Science_Summary_for_January_2021.webm&wpForReUpload=1 | a new version of this file (a Science Summary CC BY audiovisual summary for a month) here]].
Problem 1: I could not upload the full-size render because the UploadWizard had an error, without any meaningful description, after it finished uploading even though the file was smaller than [[ https://commons.wikimedia.org/wiki/File:Science_Summary_for_December_2020.webm | this video ]] that I uploaded for which the upload went through.
Problem 2: In the "Source file" when uploading the file from the local computer there is a "Maximum file size: 100 MB" which is smaller than the original file.
(Relevant notes: Despite of that videos should be automatically embedded, or even publicly hosted, with smaller rendered version in pages and only the largest renderings uploaded the commons, I tried uploading with a far lower-quality rendering for a short-term solution until this gets fixed but even that was 104 MB in size and there are some problems with the melt-renderings/Kdenlive that make running these problematic.)
**Problem 3 (this issue)**: because of Problem 2 I uploaded the .webm video to archive.org [[ https://archive.org/download/science-summary-2021-jan/ScienceSummary_2020_Jan_28.webm | here ]] and tried uploading via this URL. Next to the upload via Source URL it says: "Maximum file size: 4 GB" (the file on archive.org is smaller than that and not even the full-size render). It then loads for a while after which it displays an error page with the error "Error: 413, Request Entity Too Large".
Once problem 3 is solved, issues for problem 1 and 2 could get created as separate tasks and linked to from here.