restart the website:    systemctl restart httpd

Setting upload file size besides php.ini file:

There are a few places that wp can set its own limit.

Sometimes its coded into the theme. I couldn’t find any obvious place where it’s limiting it. 

However, I poked around, you also need to increase post_max_size. 

; Maximum size of POST data that PHP will accept.
; Its value may be 0 to disable the limit. It is ignored if POST data reading
; is disabled through enable_post_data_reading.
; http://php.net/post-max-size
post_max_size = 8M