Unable to launch activities in text channels

When I try to start an activity in a text channel, certain activities have descriptions that are so long that I am unable to find and press the launch button. I can press the apps button, click on the activity I want to use, but the page is cut off right above the button so I can't press it. I tried to scroll down to see the button, but I am unable to scroll down either. Certain activities like Rhythm, for example, work. But ones with longer descriptions, like whiteboard or color together for example, don't work, since the description is cut off and therefore I cannot press the launch button. (If it helps, I am on an Android phone)