Shortcuts won't sent more than 2 photos in an email

I've created a script that will allow me to choose photos, enter description text, get the Date Taken from the first photo (all selected photos for this task would be taken on the same date), and then send an email to a set recipient (removed from screenshots for privacy) with the input description text and Date Taken formatted as the subject line. It then deleted the photos that were selected.

The script runs fine when I select 1 or 2 photos, but 3 or more photos gives me the error "Could not run Send Email. There was a problem communicating with the app".

Is there an attachment limit I'm unaware of or is there something in my scripting that's preventing Mail from attaching any more than 2 photos?