diff --git a/boards/models/attachment/downloaders.py b/boards/models/attachment/downloaders.py
--- a/boards/models/attachment/downloaders.py
+++ b/boards/models/attachment/downloaders.py
@@ -30,15 +30,15 @@ class Downloader:
         return True
 
     @staticmethod
-    def download(url: str):
+    def download(url: str, validate):
         # Verify content headers
         response_head = requests.head(url, verify=False)
         content_type = response_head.headers[HEADER_CONTENT_TYPE].split(';')[0]
-        if content_type in TYPE_URL_ONLY:
+        if validate and content_type in TYPE_URL_ONLY:
             return None
 
         length_header = response_head.headers.get(HEADER_CONTENT_LENGTH)
-        if length_header:
+        if validate and length_header:
             length = int(length_header)
             validate_file_size(length)
         # Get the actual content into memory
@@ -63,7 +63,7 @@ class Downloader:
 
 class YouTubeDownloader(Downloader):
     @staticmethod
-    def download(url: str):
+    def download(url: str, validate):
         yt = YouTube()
         yt.from_url(url)
         videos = yt.filter(YOUTUBE_VIDEO_FORMAT)
@@ -82,7 +82,7 @@ class NothingDownloader(Downloader):
         return REGEX_MAGNET.match(url)
 
     @staticmethod
-    def download(url: str):
+    def download(url: str, validate):
         return None
 
 
@@ -93,9 +93,9 @@ DOWNLOADERS = (
 )
 
 
-def download(url):
+def download(url, validate=True):
     for downloader in DOWNLOADERS:
         if downloader.handles(url):
-            return downloader.download(url)
+            return downloader.download(url, validate=validate)
     raise Exception('No downloader supports this URL.')
 
diff --git a/boards/models/post/sync.py b/boards/models/post/sync.py
--- a/boards/models/post/sync.py
+++ b/boards/models/post/sync.py
@@ -236,7 +236,7 @@ class SyncManager:
                     tag_ref = tag_refs.find("{}[@ref='{}']".format(
                         TAG_ATTACHMENT_REF, attachment.text))
                     url = tag_ref.get(ATTR_URL)
-                    attached_file = download(hostname + url)
+                    attached_file = download(hostname + url, validate=False)
                     if attached_file is None:
                         raise SyncException(EXCEPTION_DOWNLOAD)