use message verifier purpose

app/controllers/api/active_storage_blobs_proxy_controller.rb

@@ -8,9 +8,9 @@ module Api
     skip_authorization_check
 
     def show
-      blob_uuid = ApplicationRecord.signed_id_verifier.verified(params[:signed_uuid])
+      blob_uuid, = ApplicationRecord.signed_id_verifier.verified(params[:signed_uuid])
 
-      unless blob_uuid
+      if blob_uuid.blank?
         Rollbar.error('Blob not found') if defined?(Rollbar)
 
         return head :not_found

app/controllers/api/active_storage_blobs_proxy_legacy_controller.rb

@@ -15,7 +15,8 @@ module Api
 
       is_permitted = blob.attachments.any? do |a|
         (current_user && a.record.account.id == current_user.account_id) ||
-          a.record.account.account_configs.any? { |e| e.key == 'legacy_blob_proxy' }
+          a.record.account.account_configs.any? { |e| e.key == 'legacy_blob_proxy' } ||
+          a.name == 'logo'
       end
 
       unless is_permitted