Force validate file size on sync

boards/models/attachment/downloaders.py

@@ -38,7 +38,7 b' class Downloader:'
             return None
 
         length_header = response_head.headers.get(HEADER_CONTENT_LENGTH)
-        if validate and length_header:
+        if length_header:
             length = int(length_header)
             validate_file_size(length)
         # Get the actual content into memory