I've had to jump through hoops recently to update my Android from 7 to 8, because Slack announced that it was going to stop supporting it starting from September.
Mind you, the last Android 7 version was released in Q1 2017, while the last Android 8 version is Q4 2017.
Mind you, the last Android 7 version was released in Q1 2017, while the last Android 8 version is Q4 2017.