I'm also having trouble downloading attachments and having trouble loading some screenshots as well. I'm not 100% sure but there's usually a daily restart for the website in 3/4 hours, maybe that will fix the problem. If it's not fixed by then.
One of the attachment system is down in the status page https://status.f95zone.to/ it could be the culprit for our problem here. If anyone's wanting to see if the problem is fixed yet or not, check the status page if all the attachment system is green.