No matter which device you're using, you'll always have the most up to date documents when and where you need them. With Handoff , you can start a document, email, or message on one device and pick up where you left off from another device. Some third-party apps are also compatible. On your iOS device, you can open the files from your computer with the app that you chose for File Sharing. You can't access these files from other apps or locations on your device. When iCloud or iTunes backs up your device , it backs up your shared files as well. If you delete an app with shared files from your iOS device, you also delete those shared files from your device and your iCloud or iTunes backup. There might be other ways to delete files from an app. Read your app's user guide to find out more.

If you're using macOS Catalina


Now there's an app for every media type
Before syncing your content, consider using iCloud, Apple Music, or similar services to keep content from your Mac or PC in the cloud. This way, you can access your music, photos, and more on your iOS devices when you aren't near your computer. Learn more about using Apple Music or iCloud Photos instead of your computer. Sync with Finder If you're using macOS Mojave or earlier or a PC Sync with iTunes Information about products not manufactured by Apple, or independent websites not controlled or tested by Apple, is provided without recommendation or endorsement. Apple assumes no responsibility with regard to the selection, performance, or use of third-party websites or products. Apple makes no representations regarding third-party website accuracy or reliability.
iTunes is going places.
This way, you can access your music, photos, and more on your devices when you aren't near your computer. If you see a message that your device is synced with another iTunes library, your device was previously connected to another computer. If you click "Erase and Sync" in that message, all content of the selected type on your device will be erased and replaced with content from this computer. When the computer and the device are on the same Wi-Fi network, the device appears in iTunes. The device syncs automatically whenever it's plugged in to power and iTunes is open on the computer. What you can sync with iTunes Albums, songs, playlists, movies, TV shows, podcasts, and audiobooks. Photos and videos. Contacts and calendars. Click the device icon in the upper-left corner of the iTunes window. From the list under Settings on the left side of the iTunes window, click the type of content that you want to sync or remove.
To add items on your computer to your iPhone, iPad, or iPod, you sync them using iTunes. You can have iTunes sync items automatically which is the quickest option , or drag items to your device manually which gives you more control —or you can do both. You can also remove items from your device automatically or manually.