fix pdf generation

app/controllers/submissions_controller.rb

@@ -60,7 +60,7 @@ class SubmissionsController < ApplicationController
     submissions_params[:submission].to_h.map do |_, attrs|
       submission = @template.submissions.new
 
-      attrs[:submitters].each do |_, submitter_attrs|
+      attrs[:submitters].each do |submitter_attrs|
         submission.submitters.new(**submitter_attrs, sent_at: params[:send_email] == '1' ? Time.current : nil)
       end
 
@@ -69,7 +69,7 @@ class SubmissionsController < ApplicationController
   end
 
   def submissions_params
-    params.permit(submission: { submitters: %i[uuid email] })
+    params.permit(submission: { submitters: [%i[uuid email]] })
   end
 
   def load_template