diff --git a/app/models/pixiv_ugoira_frame_data.rb b/app/models/pixiv_ugoira_frame_data.rb
index dea12e13b..f6c749bcb 100644
--- a/app/models/pixiv_ugoira_frame_data.rb
+++ b/app/models/pixiv_ugoira_frame_data.rb
@@ -7,7 +7,7 @@ class PixivUgoiraFrameData < ApplicationRecord
     
     if data[0]["delay_msec"]
       self.data = data.map.with_index do |datum, i|
-        filename = "%06d.jpg" % [i + 1]
+        filename = "%06d.jpg" % [i]
         {"delay" => datum["delay_msec"], "file" => filename}
       end
     end
diff --git a/app/models/post.rb b/app/models/post.rb
index 13e88abe6..70ab22905 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -161,6 +161,18 @@ class Post < ApplicationRecord
       storage_manager.file_url(self, :preview)
     end
 
+    def file_path
+      storage_manager.file_path(md5, file_ext, :original)
+    end
+
+    def large_file_path
+      storage_manager.file_path(md5, file_ext, :large)
+    end
+
+    def preview_file_path
+      storage_manager.file_path(md5, file_ext, :preview)
+    end
+
     def open_graph_image_url
       if is_image?
         if has_large?