Update 2: For some reason, maybe after recent Joomla update, I again can't upload images through Helix's Blog Options tab when adding an article.
The images are added to the server (i see every file ending up in the FTP folder) but nothing happens inside the editor; the image never gets attached and included.
Also, this time, the PHP version doesn't make a difference, neither does disabling cloudflare or editing htaccess for extra PHP limits. I have also reinstalled Helix Ultimate Plugin, and reinstalled Joomla core files. I am out of options.... and really wish this would work as intended.
In console, I see what I think resembles a javascript error and an 500 error regarding POST.
Any ideas?