If you like me tried to create a Tiled/Mosaic Gallery in Jetpack in a localhost website you’re building, you may be surprised that this feature is no longer available starting with Jetpack 4.8 when the Settings page was redesigned.
As you may have already know, in order to use the Tiled Galleries feature starting with Jetpack 4.8+, you have to enable the Photon feature as well: