IT WORKED!! I edited the file in nano
(which was really hard for nano) and hard-reloaded the window (no need to restart server). Now files upload in 1MB chunks as I configured! See GIF: https://a5ra.qonq.gq/
Now it uploads faster although not as fast as I thought because now the server is slower to respond to larger chunks. I set it to 1MB because I read that’s the default limit for nginx, but I’m waiting for sysadmin to configure my vhost to allow 50MB to match cloudflare, and it should be better then.