Conditional attachments in sendmail function

Conditional attachments in sendmail function

I would like to have a hand-full of checkboxes that say "Invoice" , "Contract" , "File 1" , "File 2" etc.

And when each of the checkboxes are checked, I would like to add them as Attachments in a sendmail function like so

  2. sendmail
  3.     (
  4.         To       :  input.Client_Name.Email 
  5.         From     :  zoho.adminuserid 
  6.         Subject  :  input.Subject_field 
  7.         Message  :  input.Message 
  8.         Attachments : "all checked boxes"
  9.     )
I tried creating a list with all of the boxes that are checked and inputing that list in the attachments like so

  2. list = {template: Invoice as PDF, file:input.lookup.file_string} 
  3. sendmail
  4. (
  5. -
  6. -
  7. -
  8. Attachments : list
  9. )
But this doesnt work. Any ideas?