When i try upload attachment in some bug , mantis show error aplication error 505:
APPLICATION ERROR #505
Uploaded file could not be moved to the file storage directory. Directory either does not exist or not writable to webserver.
Please use the "Back" button in your web browser to return to the previous page. There you can correct whatever problems were identified in this error or select another action. You can also click an option from the menu bar to go directly to a new section.

In my config_inc._php :

#ATTACHMENTS

$g_allow_file_upload = ON;
$g_file_upload_method = DISK;

In a proyect : Upload File Path = /var/www/html/mantis/attachments/
The folder has all grant (chmod 777) and he has attachents from before ( this mantis is a import of mantis hub). I can see this attachment from mantis application.

Only Upload attachment if the folder is /tmp . But if i see the filesystem is show this:
/tmp/systemd-private-27cb6c690a414a4cb4b151f36e73bdba-httpd.service-G0W8CR/tmp
and into in this folder is the attachment.

I check all setup file and all is right.

Can you help me?

Thank you!