Use the built-in Gallery block and set the Link To option to Media File under block settings. The theme will automatically detect the links and open them in a gallery modal window.
TEST TEST TEST 
Average distance traveled by people in the NYC area on 2020-03-22. Image credit: Creative Commons. 
Primary colors represent the spike protein of the novel coronavirus’s three protein chains. 
Orbiting_Conceptual Drawing. Courtesy of Thom Kubli and Hiroshi Ishii. 
Wiesner Student Art Gallery Exhibition Misalignments, March 2020.
