diff --git a/app/models/metadata_file.rb b/app/models/metadata_file.rb
index 00ac7af0..c7296de4 100644
--- a/app/models/metadata_file.rb
+++ b/app/models/metadata_file.rb
@@ -68,18 +68,8 @@ class MetadataFile < MetadataTemplate
       when ActionDispatch::Http::UploadedFile
         site.static_files.last if site.static_files.attach(value['path'])
       when String
-        if (blob_id = ActiveStorage::Blob.where(key: key_from_path, service_name: site.name).pluck(:id).first)
-          site.static_files.find_by(blob_id: blob_id)
-        elsif path? && pathname.exist? && site.static_files.attach(io: pathname.open, filename: pathname.basename)
-          site.static_files.last.tap do |s|
-            s.blob.update(key: key_from_path)
-          end
-        else
-          raise ArgumentError, 'No se pudo subir el archivo'
-        end
+        site.static_files.find_by(blob_id: blob_id) || migrate_static_file!
       end
-  rescue ArgumentError => e
-    ExceptionNotifier.notify_exception(e, data: { site: site.name, path: value['path'] })
   end
 
   # Obtiene la ruta absoluta al archivo
@@ -95,7 +85,7 @@ class MetadataFile < MetadataTemplate
   #
   # @return [String]
   def key_from_path
-    pathname.dirname.basename.to_s
+    @key_from_path ||= pathname.dirname.basename.to_s
   end
 
   def path?
@@ -148,4 +138,32 @@ class MetadataFile < MetadataTemplate
   def no_file_for_description?
     !path? && description?
   end
+
+  # Obtiene el id del blob asociado
+  #
+  # @return [Integer,nil]
+  def blob_id
+    @blob_id ||= ActiveStorage::Blob.where(key: key_from_path, service_name: site.name).pluck(:id).first
+  end
+
+  # Genera el blob para un archivo que ya se encuentra en el
+  # repositorio y lo agrega a la base de datos.
+  #
+  # @return [ActiveStorage::Attachment]
+  def migrate_static_file!
+    raise ArgumentError, 'El archivo no existe' unless path? && pathname.exist?
+
+    Site.transaction do
+      blob =
+        ActiveStorage::Blob.create_after_unfurling!(key: key_from_path,
+                                                    io: pathname.open,
+                                                    filename: pathname.basename,
+                                                    service_name: site.name)
+
+      ActiveStorage::Attachment.create!(name: 'static_files', record: site, blob: blob)
+    end
+  rescue ArgumentError => e
+    ExceptionNotifier.notify_exception(e, data: { site: site.name, path: value['path'] })
+    nil
+  end
 end