Appending a ZIP file to the end of a JPG image is a straightforward process because the JPEG format's structure allows the image to remain valid and viewable in image viewers, while the ZIP file remains accessible with archive managers.
Use the strings command again, but specify the encoding option strings data01 -e {b,l}. Remember when the "test" file was deleted? The rm command was used, not shred. The file name data still resides in the file table and is recoverable because of this.