About the WordPress Photo & Video Gallery, is the gallery responsive? Can the videos be played in 'auto play' or in sequence?
1. Yes, the gallery is responsive. In the Options tab -> Gallery Option, there is an option Responsive - Support responsive web design.
2. In the same tab, there is an option "Auto slide". If this option is on, the gallery will auto play the image slideshow. But it still won't auto play video.
3. In the same tab, there is an option "Automatically play video". When this option is on, it will automatically play video and if the option "Auto slide" is on, it will play in sequence. But "auto play video" is not supported on mobile and tablets, it's a limitation of the devices.