The official #Mastodon apps have been updated ? Update to the latest versions to see new features.
Highlights:
:android: Official Android app now lets you edit your posts. Click ⋯ on a post and "Edit". You can also bookmark posts now.
:apple_inc: Official iPhone / iPad app now lets you follow hashtags. To follow a hashtag, search for a hashtag and click the "Follow" button. To see your followed tags, go to your profile page and click the # icon at the top.