Fixed it - that error above in the NGINX log led me to my answer.
In nginx.conf I needed to increase the
client_max_body_size 20M;
Once I did that and restarted NGINX all is well.
never mind - answered my own mod-security question.
Of note I'm noticing this in the NGINX log:
2018/06/27 14:45:38 [error] 20829#20829: *4208 client intended to send too large body: 2931161 bytes
Just about 3MB and again all settings are 5MB or greater.
You'd think I'd never worked in tech support (I do and have for 20 years) I know better.
Sorry about that. As for generic error - it doesn't pop anything up - it just draws a line through the image when doing "attach file". Generic error was probably not the right term.
As for a general idea...
So I've seen a million threads on this and I've tried all of the settings that I've come across. I *know* I've missed something - but I haven't been able to figure it out.
Uploading images - I have the forum set to 5MB - image size isn't our problem. However it does seem that resolution size...
So I am setup such that my install references everything without the WWW.
My DNS records have a CNAME that points the www to base A record.
My NGINX config looks like so:
server {
server_name societyofsmoke.com;
root /var/www/html/;
location / {
index index.php...