allow to upload user initials

app/models/user.rb

@@ -50,6 +50,7 @@ class User < ApplicationRecord
   EMAIL_REGEXP = /[^@;,<>\s]+@[^@;,<>\s]+/
 
   has_one_attached :signature
+  has_one_attached :initials
 
   belongs_to :account
   has_one :access_token, dependent: :destroy

app/models/user_config.rb

@@ -22,6 +22,7 @@
 #
 class UserConfig < ApplicationRecord
   SIGNATURE_KEY = 'signature'
+  INITIALS_KEY = 'initials'
   RECEIVE_COMPLETED_EMAIL = 'receive_completed_email'
 
   belongs_to :user