Solved in 13.7.1! You guys are amazing!
I tried with many sites and it works flawlessly now.
Here's a simple visual example to showcase what DO can do and hopefully encourage others to dive into DO scripting.
Scanning a file with VT: You can check any file up to 650mb.
When the file is in the database, it looks like this:
You can check even the behaviour in sandboxes!
If it's not, the upload now works smoothly without any workaround!
(I don't continue the query here on purpose, because the file stays 'queued' when consulting via API for like a minute or more, better to open the link IMO)
Many thanks!