store multiple submitter results

app/controllers/api/attachments_controller.rb

@@ -5,14 +5,14 @@ module Api
     skip_before_action :authenticate_user!
 
     def create
-      submission = Submission.find_by!(slug: params[:submission_slug]) unless current_account
+      submitter = Submitter.find_by!(slug: params[:submitter_slug]) unless current_account
 
       blob = ActiveStorage::Blob.find_signed(params[:blob_signed_id])
 
       attachment = ActiveStorage::Attachment.create!(
         blob:,
         name: params[:name],
-        record: submission || current_account
+        record: submitter || current_account
       )
 
       render json: attachment.as_json(only: %i[uuid], methods: %i[url filename content_type])