Photo Overlays
Overlays should be a transparent PNG file. It should match the image dimensions & orientation you plan to use for that album experience
Square:
1280 x 1280
4:3
Portrait : 1080x1440
Landscape: 1440x1080
4:6
Portrait: 1200x1800
Landscape: 1800x1200
16:9
Portrait: 1080x1920
Landscape: 1920x1080
Microsite Backgrounds
File Types: .png / .jpeg
1920 (w) x 1080 (h)
Logos
File Types: .png / .jpeg
Sizes: Maximum 1024 (w) x 1024 (h)