fix: Attach instagram images with file type story_mentions (#4100)

app/models/attachment.rb

@@ -34,7 +34,7 @@ class Attachment < ApplicationRecord
   has_one_attached :file
   validate :acceptable_file
 
-  enum file_type: [:image, :audio, :video, :file, :location, :fallback]
+  enum file_type: [:image, :audio, :video, :file, :location, :fallback, :share, :story_mention]
 
   def push_event_data
     return unless file_type

app/models/message.rb

@@ -64,7 +64,7 @@ class Message < ApplicationRecord
   # [:deleted] : Used to denote whether the message was deleted by the agent
   # [:external_created_at] : Can specify if the message was created at a different timestamp externally
   store :content_attributes, accessors: [:submitted_email, :items, :submitted_values, :email, :in_reply_to, :deleted,
-                                         :external_created_at], coder: JSON
+                                         :external_created_at, :story_sender, :story_id], coder: JSON
 
   store :external_source_ids, accessors: [:slack], coder: JSON, prefix: :external_source_id