Difficulty sideloading to a Fenix 5 Plus

I am trying to sideload an app for testing on my Fenix 5 Plus. I followed the standard procedure of generating a .prg file and then copying it into the Apps folder. However, I can not see that app in my activities/apps UI screen. Any ideas on what the issue could be?

I tried uploading the default template app as well and it did not see to work either.