Hi Demiplane crew! Quick bug, hopefully a quick fix 
The Shove action (found on p. 53 of Beta Rules Preview PDF) is missing from the Actions tab on character sheets. Double-checked to make sure it wasn’t hidden and still couldn’t find it.
I saw that it was in the Actions listings and is linked in the Avoid Danger reaction. I can link a character but this the case around all characters from what I’ve seen (mobile and desktop).