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diff --git a/lib/pleroma/web/multipart.ex b/lib/pleroma/web/multipart.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2023 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+# <https://hexdocs.pm/plug/Plug.Parsers.MULTIPART.html#module-dynamic-configuration>
+defmodule Pleroma.Web.Multipart do
+  @multipart Plug.Parsers.MULTIPART
+
+  def init(opts) do
+    opts
+  end
+
+  def parse(conn, "multipart", subtype, headers, opts) do
+    length = Pleroma.Config.get([:instance, :upload_limit])
+    opts = @multipart.init([length: length] ++ opts)
+    @multipart.parse(conn, "multipart", subtype, headers, opts)
+  end
+
+  def parse(conn, _type, _subtype, _headers, _opts) do
+    {:next, conn}
+  end
+end