Browser discord is much more limited than the app. There are many points about this, for example discord optimization in the browser is far behind the app in my experience. And this is not the only example. I advise you to use the application, it is supported and works much better.
https://www.reddit.com/r/discordapp/comments/12cv4vk/whats_better_the_browser_version_or_the_app/

