I tried the command provided by Erulez, only the correct path is /usr/local/directadmin/scripts
After running this command, it still doesn't work. I verified that uploading images and updating plugins had worked previously, on the old server I ported over from, but for some reason it just won't work on this new server. I cannot upload images into wordpress, and I cannot update themes, plugins, or the wordpress core itself. And the user permissions are all correct. I also tried changing the mode to fastcgi, and that didn't work at all, so I changed it back to php-fpm.
Is there anything else that I can try? Perhaps there is a setting in DA that I am missing, in order to allow wordpress to modify the files? Most of the sites I was attempting to migrate to this new server are wordpress sites, and they won't be able to have any new images added to them (except, perhaps, manually). Any suggestions would be appreciated. Perhaps there is something I need to set up in the CustomBuild plugin?
One other thing, I noticed in the service monitor that the service called "named" is not active, and cannot be started. Was that replaced by httpd, or is that something else entirely? And would installation of that module be likely to fix this issue? Thanks again for all your help.
If I do need to submit a ticket, how would I do so? Thank you so much!