"""
@type file_spec :: {:file | :url, String.t()}
@callback put_file(Pleroma.Upload.t()) ::
:ok | {:ok, file_spec()} | {:error, String.t()} | :wait_callback
"""
@type file_spec :: {:file | :url, String.t()}
@callback put_file(Pleroma.Upload.t()) ::
:ok | {:ok, file_spec()} | {:error, String.t()} | :wait_callback