54I want to show this on a screen

A slideshow on your own device, cast to the television, or a TV that follows you

Before you start
1
Start a Slideshow

Open a pattern, a project, a stash entry or a list, and choose Play from its actions. The item goes fullscreen, its photographs drift slowly across the screen, and it moves on by itself. Where you started from a list, it plays the whole list.

Tip: Turn on Presentation buttons in the header if you use this often - it adds play and skip beside the title, so a slideshow is one tap rather than two. The action stays in the menu either way; the switch only decides where the button lives.
2
Set the Pace

Settings → Appearance → Slide Timing holds two dials. Time per item is how long one pattern holds the screen. Time per photo is how long each of its photographs is shown - so an item with many photos shows more of them, and an item with one photo simply holds it. The screen tells you how the two combine: up to N photos per item, N seconds each; fewer photos are each held longer.

Worth knowing
Why there is a floor
Photographs cross-fade into each other. Below about five seconds the next picture starts fading in before the last has finished, and nothing is ever cleanly on screen - so very short dwells are not offered.
Knit night pacing
Slower than feels right when you set it. People look up, talk, look back; a pattern that holds for half a minute is a pattern somebody actually saw.
3
Put It on the Television

With a television paired, Play first asks where: This Device, or the television by name. Choose the television and it plays there - with the remote controls on your phone, so you can skip ahead or pause without getting up.

What travels with it is your setup, not the television's: your timings, how many photos each item gets, whether notes are shown, and your theme. A television with its own preferences keeps them for its own slideshows.

4
Let the TV Follow You

The same chooser offers Follow along. Turn it on and whatever you open on your phone appears on the television - you keep browsing in your hands while the room watches the big screen. It is the better choice for a group: nobody waits for a slideshow to reach the pattern they asked about.

Stop following ends it, and the television goes back to its own screen.

Pairing a television, and what each TV app can do: Pair Your Devices.

Available on iPhone, iPad, Android, and web at app.stash2go.com