also 755
Attachments are not visible on server
How do I do that? (Linux noob here)
found something ? 
is this what you mean?
when I run this I get : bash: sudo: command not found
it is Linux, but since it's hosted I don't see what version it is
if this helps
Waltervds
Maybe you don't have permission to run commands, check it and change it via GUI or ask your hoster to change it for you
It should be set as: All folders should be 755 and all files should be 644
run this command to see which version of Linux you are using:
lsb_release -a
or
hostnamectl
both commands also give not found .
The strange thing is the folders that are created by the plugin all get 1355 where it seems to me they should get 755
Waltervds
Contact your hoster and ask them to help you setup correct permission, then work out any other issues
it's a very simple process to setup osTicket if permission, database, web server meets the requirements
https://docs.osticket.com/en/latest/Getting%20Started/Installation.html