3 files changed, 5 insertions, 5 deletions
diff --git a/activestorage/lib/active_storage/analyzer.rb b/activestorage/lib/active_storage/analyzer.rb
index 837785a12b..7c4168c1a0 100644
--- a/activestorage/lib/active_storage/analyzer.rb
+++ b/activestorage/lib/active_storage/analyzer.rb
@@ -26,7 +26,7 @@ module ActiveStorage
     end
 
     private
-      def logger
+      def logger #:doc:
         ActiveStorage.logger
       end
   end
diff --git a/activestorage/lib/active_storage/downloading.rb b/activestorage/lib/active_storage/downloading.rb
index 3dac6b116a..a57fda49b4 100644
--- a/activestorage/lib/active_storage/downloading.rb
+++ b/activestorage/lib/active_storage/downloading.rb
@@ -5,7 +5,7 @@ module ActiveStorage
     private
       # Opens a new tempfile in #tempdir and copies blob data into it. Yields the tempfile.
       def download_blob_to_tempfile # :doc:
-        Tempfile.open("ActiveStorage", tempdir) do |file|
+        Tempfile.open([ "ActiveStorage", blob.filename.extension_with_delimiter ], tempdir) do |file|
           download_blob_to file
           yield file
         end
diff --git a/activestorage/lib/active_storage/previewer.rb b/activestorage/lib/active_storage/previewer.rb
index 3d485988e9..7db9ae5956 100644
--- a/activestorage/lib/active_storage/previewer.rb
+++ b/activestorage/lib/active_storage/previewer.rb
@@ -42,7 +42,7 @@ module ActiveStorage
       #   end
       #
       # The output tempfile is opened in the directory returned by ActiveStorage::Downloading#tempdir.
-      def draw(*argv) # :doc:
+      def draw(*argv) #:doc:
         Tempfile.open("ActiveStorage", tempdir) do |file|
           capture(*argv, to: file)
           yield file
@@ -51,11 +51,11 @@ module ActiveStorage
 
       def capture(*argv, to:)
         to.binmode
-        IO.popen(argv) { |out| IO.copy_stream(out, to) }
+        IO.popen(argv, err: File::NULL) { |out| IO.copy_stream(out, to) }
         to.rewind
       end
 
-      def logger
+      def logger #:doc:
         ActiveStorage.logger
       end
   end