@SlackHQ you should remove the default browser option from ios. ios 14 has a default browser setting, mine is set to use Firefox but slack won’t let me pick it. slack is worse than the default at handling this now 
Hi there, sorry about the trouble. While we don't have plans to change this behaviour right now, we can see why this would be of benefit. The team are always considering feedback like this closely so we will share your suggestion with them.