The official #Mastodon app for iOS/iPad has been updated to version 1.4.9

This includes support for automatic post translation (if your server supports it), and link previews including embedded video/audio. Have a look at @FediVideo to see some embedded videos.

If the app hasn't updated automatically, can update it manually by going to the App Store, click on your App Store profile icon and then scroll down to see apps with updates waiting. Tap "update" to start it updating.