Original HowCurio practice files, free to use and adapt. Repeated market list and synthetic JPEG pattern. Native 7-Zip standalone ZIP output, no GUI trial. Each archive passed Test and extracted bytes matched its original SHA-256. The reduction percent compares entire ZIP bytes to its one source file; negative means ZIP is larger.

market-list.txt: input 83200 bytes, ZIP level 0: 83364 bytes, reduction -0.2%.
market-list.txt: input 83200 bytes, ZIP level 9: 490 bytes, reduction 99.41%.
pattern.jpg: input 18847 bytes, ZIP level 0: 19003 bytes, reduction -0.83%.
pattern.jpg: input 18847 bytes, ZIP level 9: 16616 bytes, reduction 11.84%.
Your own photo/video results will differ. Store mode packages files without compressing them.