diff --git a/main.py b/main.py
index f9d415c..b08e821 100644
--- a/main.py
+++ b/main.py
@@ -1,3 +1,4 @@
+import os
 import json
 import aiohttp
 import pprint
@@ -187,6 +188,7 @@ async def download_images(ctx):
         log.info("processing post %r", md5)
         existing_post = await fetch_post(ctx, md5)
         if existing_post:
+            log.info("already exists %r", md5)
             continue
 
         # download the post
@@ -194,10 +196,10 @@ async def download_images(ctx):
         post_url_path = Path(urlparse(post_file_url).path)
         good_extension = False
         for extension in ALLOWED_EXTENSIONS:
-            if extension in post_url_path.stem:
+            if extension in post_url_path.suffix:
                 good_extension = True
         if not good_extension:
-            log.info("ignoring %r, invalid extension (%r)", md5, post_url_path.stem)
+            log.info("ignoring %r, invalid extension (%r)", md5, post_url_path.suffix)
             continue
         post_filename = post_url_path.name
         post_filepath = DOWNLOADS / post_filename