If you can't find the lost files even after connecting SD card to computer. They may be lost due to accidental interruption of the connection between SD card and your S7.
If you get some luck, the system may have saved a copy of the files to LOST.DIR folder on SD card. Here is a tutorial about how to recover photos from LOST.DIR folder on SD card. You'll definitely lose the file name even if the image files can be restored, but it would be much better than nothing at all.