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	diff --git a/lib/pleroma/upload/filter.ex b/lib/pleroma/upload/filter.ex
	index c677d4b9f..e5db2fb20 100644
	--- a/lib/pleroma/upload/filter.ex
	+++ b/lib/pleroma/upload/filter.ex
	@@ -1,46 +1,46 @@
	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
	# SPDX-License-Identifier: AGPL-3.0-only

	defmodule Pleroma.Upload.Filter do
	@moduledoc """
	Upload Filter behaviour

	This behaviour allows to run filtering actions just before a file is uploaded. This allows to:

	* morph in place the temporary file
	* change any field of a `Pleroma.Upload` struct
	* cancel/stop the upload
	"""

	require Logger

	- @callback filter(Pleroma.Upload.t()) ::
	+ @callback filter(upload :: struct()) ::
	{:ok, :filtered}
	\| {:ok, :noop}
	- \| {:ok, :filtered, Pleroma.Upload.t()}
	+ \| {:ok, :filtered, upload :: struct()}
	\| {:error, any()}

	- @spec filter([module()], Pleroma.Upload.t()) :: {:ok, Pleroma.Upload.t()} \| {:error, any()}
	+ @spec filter([module()], upload :: struct()) :: {:ok, upload :: struct()} \| {:error, any()}

	def filter([], upload) do
	{:ok, upload}
	end

	def filter([filter \| rest], upload) do
	case filter.filter(upload) do
	{:ok, :filtered} ->
	filter(rest, upload)

	{:ok, :filtered, upload} ->
	filter(rest, upload)

	{:ok, :noop} ->
	filter(rest, upload)

	error ->
	Logger.error("#{__MODULE__}: Filter #{filter} failed: #{inspect(error)}")
	error
	end
	end
	end