diff --git a/docs/config.md b/docs/config.md
index 703ef67dd..55311b76d 100644
--- a/docs/config.md
+++ b/docs/config.md
@@ -18,6 +18,7 @@ Note: `strip_exif` has been replaced by `Pleroma.Upload.Filter.Mogrify`.
 
 ## Pleroma.Uploaders.S3
 * `bucket`: S3 bucket name
+* `bucket_namespace`: S3 bucket namespace
 * `public_endpoint`: S3 endpoint that the user finally accesses(ex. "https://s3.dualstack.ap-northeast-1.amazonaws.com")
 * `truncated_namespace`: If you use S3 compatible service such as Digital Ocean Spaces or CDN, set folder name or "" etc.
 For example, when using CDN to S3 virtual host format, set "".
diff --git a/lib/pleroma/uploaders/local.ex b/lib/pleroma/uploaders/local.ex
index fc533da23..36b3c35ec 100644
--- a/lib/pleroma/uploaders/local.ex
+++ b/lib/pleroma/uploaders/local.ex
@@ -11,7 +11,7 @@ defmodule Pleroma.Uploaders.Local do
 
   def put_file(upload) do
     {local_path, file} =
-      case Enum.reverse(String.split(upload.path, "/", trim: true)) do
+      case Enum.reverse(Path.split(upload.path)) do
         [file] ->
           {upload_path(), file}
 
@@ -23,7 +23,7 @@ defmodule Pleroma.Uploaders.Local do
 
     result_file = Path.join(local_path, file)
 
-    unless File.exists?(result_file) do
+    if not File.exists?(result_file) do
       File.cp!(upload.tempfile, result_file)
     end
 
diff --git a/lib/pleroma/uploaders/mdii.ex b/lib/pleroma/uploaders/mdii.ex
index 237544337..c36f3d61d 100644
--- a/lib/pleroma/uploaders/mdii.ex
+++ b/lib/pleroma/uploaders/mdii.ex
@@ -3,6 +3,8 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Uploaders.MDII do
+  @moduledoc "Represents uploader for https://github.com/hakaba-hitoyo/minimal-digital-image-infrastructure"
+
   alias Pleroma.Config
   alias Pleroma.HTTP
 
diff --git a/test/uploaders/local_test.exs b/test/uploaders/local_test.exs
new file mode 100644
index 000000000..fc442d0f1
--- /dev/null
+++ b/test/uploaders/local_test.exs
@@ -0,0 +1,32 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Uploaders.LocalTest do
+  use Pleroma.DataCase
+  alias Pleroma.Uploaders.Local
+
+  describe "get_file/1" do
+    test "it returns path to local folder for files" do
+      assert Local.get_file("") == {:ok, {:static_dir, "test/uploads"}}
+    end
+  end
+
+  describe "put_file/1" do
+    test "put file to local folder" do
+      file_path = "local_upload/files/image.jpg"
+
+      file = %Pleroma.Upload{
+        name: "image.jpg",
+        content_type: "image/jpg",
+        path: file_path,
+        tempfile: Path.absname("test/fixtures/image_tmp.jpg")
+      }
+
+      assert Local.put_file(file) == :ok
+
+      assert Path.join([Local.upload_path(), file_path])
+             |> File.exists?()
+    end
+  end
+end
diff --git a/test/uploaders/mdii_test.exs b/test/uploaders/mdii_test.exs
new file mode 100644
index 000000000..d432d40f0
--- /dev/null
+++ b/test/uploaders/mdii_test.exs
@@ -0,0 +1,50 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Uploaders.MDIITest do
+  use Pleroma.DataCase
+  alias Pleroma.Uploaders.MDII
+  import Tesla.Mock
+
+  describe "get_file/1" do
+    test "it returns path to local folder for files" do
+      assert MDII.get_file("") == {:ok, {:static_dir, "test/uploads"}}
+    end
+  end
+
+  describe "put_file/1" do
+    setup do
+      file_upload = %Pleroma.Upload{
+        name: "mdii-image.jpg",
+        content_type: "image/jpg",
+        path: "test_folder/mdii-image.jpg",
+        tempfile: Path.absname("test/fixtures/image_tmp.jpg")
+      }
+
+      [file_upload: file_upload]
+    end
+
+    test "save file", %{file_upload: file_upload} do
+      mock(fn
+        %{method: :post, url: "https://mdii.sakura.ne.jp/mdii-post.cgi?jpg"} ->
+          %Tesla.Env{status: 200, body: "mdii-image"}
+      end)
+
+      assert MDII.put_file(file_upload) ==
+               {:ok, {:url, "https://mdii.sakura.ne.jp/mdii-image.jpg"}}
+    end
+
+    test "save file to local if MDII  isn`t available", %{file_upload: file_upload} do
+      mock(fn
+        %{method: :post, url: "https://mdii.sakura.ne.jp/mdii-post.cgi?jpg"} ->
+          %Tesla.Env{status: 500}
+      end)
+
+      assert MDII.put_file(file_upload) == :ok
+
+      assert Path.join([Pleroma.Uploaders.Local.upload_path(), file_upload.path])
+             |> File.exists?()
+    end
+  end
+end