Hi Kylie Donia I am using the new collector on an iPad (19.0.1) and the arcade expressions are showing up as completely blank.
On Collector Classic it shows the horrible ${expression/exri1} for both the related record field info and the arcade expression.
On Collector (new) both of these are completely missing.
I have also tried to use Explorer (both Windows and Apple) but again there is nothing there where the related record field info and arcade expression are completely missing.