One of the great new features in iOS 11 and macOS High Sierra is shared documents. You can create almost any kind of file, and collaborate on it with other people. This can be a simple Pages document, or a complex song in GarageBand. In theory, the file will be updated with everybody’s changes, so you can work on the same project without emailing a zillion copies back and forth.

Currently, this feature ranges from a little shaky, to rock solid, depending on what apps you are using. Here’s how to share and collaborate using GarageBand in iOS 11.

If you use emojis, the iOS keyboard is fantastic. It suggests emojis for you as you type words, and you can insert them into your messages with a tap. But what about the Mac? How can you add emojis with the keyboard on the desktop? And how can you force iOS to remember shortcuts for your favorite emoji on the iPhone and iPad? The answer to both is Text Replacement, which is built into both macOS and iOS.

Apple’s own Mail app is pretty amazing in iOS 11 and macOS High Sierra, and is more than good enough for most people. But Cult of Mac readers aren’t “most people,” and that’s where Readdle’s Spark comes in. If you’re looking for more features, like scheduled sending, automatic follow-ups, and integrations with third-party apps and services, then Spark is the place to look. Today we’ll look at how to use these great new features.

You know how when you’re on a FaceTime call with your parents, and your father holds his favorite recipe up to the camera, and you use the screenshot to capture a photo of it? Well, now there’s a proper, official way to capture images from FaceTime calls. Even better, they’re not just stills. The captures are Live Photos, so you can relive that goofy smile from your grandparent long after they’re gone.

The latest version of iTunes — 12.7 — removes the App Store. That’s bad news for folks who like to keep backups of old iOS apps around, but good news for people who have bloat and clutter. But the update also removes all your custom ringtones, so you can’t manage them from your Mac.

Don’t despair. You can still download purchased ringtones, and copy your own tones across from the Mac. It’s just not obvious how to do it any more.

If your Mac is sick, the first step is to restart it. But did you know that there are several tricks you can perform while your Mac is starting up?

Many of these are advanced Mac diagnostic tools, which shouldn’t be used unless you really know what you’re doing. But some not-so-secret startup keyboard combos will remove a stuck disk (if your Mac is old enough to even have a disk inside), let you boot your Mac from a USB drive, or to turn your entire computer into one big storage disk to connect to another computer.

You probably spend a lot of time in the macOS Finder. Much of it is likely spent pointing and clicking, using the trackpad pointer to duplicate files, or to click back to the folder you were in a moment ago.

But, like most Mac apps, the Finder offers a ton of useful keyboard shortcuts — to create new folders, navigate files and change what you see in the Finder window. If you learn a couple of them, you can spend a lot less time dithering with your mouse. You will also look like a cool TV or movie hacker if you click on the keyboard instead.

Today, we’ll look at the most useful day-to-day Finder keyboard shortcuts.

By default, any screenshots you take on your Mac, iPad or iPhone get saved as PNG files. That’s great, because PNG files are pixel-perfect, and they support transparency (for those neat floating-window shadows).

But they’re not JPEGs, which means they’re not universally supported. Luckily, you can easily make JPEG screenshots the default, at least on the Mac.

iTunes on the Mac, and the Videos app on iOS, both have great support for subtitles. You can add subtitles for multiple languages, and the iOS 11 video player can even pull in subtitles from YouTube videos. Subtitles help out of you have hearing loss, or if you’re watching shows and movies in a foreign language. And a lot of the time, actors are so mumbly that having subs is essential to follow the story, even in your own language, and with the sound jacked up. But unless you’re buying movies and TV shows from the iTunes store, how do you add subtitles to your videos? The good news is that it’s easy, and once you’ve bought our preferred app — SubsMarine — it’s also free.

Since last fall, your Mac and your iOS devices have shared a Universal Clipboard. That is, you can copy on one device and paste on another. It’s seamless, and incredibly useful. For instance, you could copy a shipment tracking number in Mail on your Mac, then paste it into the tracking app on your iPhone. Or you could take a screenshot on your iPhone, then paste it into a blog post you’re writing on your iPad.

Universal Clipboard is so easy to use, you might have already used it without realizing. Here’s how it works.