Large images are not loading. What could be the problem?

Question

PHP

Good afternoon.
Recently asked a question. Helped a lot. Pleased with such a reaction. Need more help and advice.
I have a site www.somon.tj, which I transferred to VPS. Debt struggled with the settings, but it seemed to work a little faster than on shared hosting. VPS 6 cores, 6 gigs of RAM. But there was one problem. Now, when you add an ad here www.somon.tj/q/show_edit_adv/fa/-1/, when you start uploading an image, photos larger than 1 mb simply won't load. Not loading. Hangs.
There was no such problem with shared hosting. Most likely problems with the VPS are either in the settings or in the channel, but I can’t understand the reason. Help me please. Give advice.
Tried 1 Mbps channel, tried 3g with 3-4 Mbps.
PS The most interesting thing was that there was another VPS on which there was another site. The problem was the same. Moved back to shared, everything was fine.

Answer 1

Most likely a limitation in the php settings. By default, there are small values ​​​​for upload and post.

Answer 2

I had an absolutely identical problem. A site on WordPress, a freshly bought VPS - and on uploading more than 300 kilobytes of photos there was either an HTTP Error or 500 - ISE.
I wrote to the hoster - they fixed it like this:
"Alexander (Tech.Pod): We raised one of the fastcgi limits - MaxRequestLen".
Everything worked.

Answer 3

Dig into the php.ini settings