That thumbnail is for grid-size, it's generally 50kb or less in size which ends up being around 300x240 or up to 500x500 on newer codecs. It'll be visibly low-

That thumbnail is for grid-size, it's generally 50kb or less in size which ends up being around 300x240 or up to 500x500 on newer codecs. It'll be visibly low-res and blurry until the full size decodes for full screen. Hence why I said "when tapping on a thumbnail"