English to Chinese Tech/Engineering IT (Information Technology) security

It’s also worth bearing in mind that almost all the images you see on social media have been modified and compressed [on their way to] a data server, making it very difficult for a bad actor to hide code that’s still fully preserved by the time the image makes it in front of anyone’s eyeballs. Image-based malware isn’t a particularly common threat, but it’s still worth knowing about and protecting yourself from.
是说在发送到数据服务器之前就已经被改动和压缩了吗？即被改动和压缩之后才发送到数据服务器？