A true statement about the use of compression when users send attachments on a social media platform is: Lossy compression of an image file generally provides a greater reduction in transmission time than lossless compression does. This is because lossy compression removes some data from the file, resulting in smaller file sizes and faster transmission, whereas lossless compression preserves all data but typically achieves less reduction in size. Lossy compression, however, sacrifices some quality permanently, while lossless compression allows full restoration of the original file.