"Attach Uploaded Files To Post" doesn't works

Hello dev.

The function “Attach Uploaded Files To Post” doesn’t works for me.
What’s happening?

This is my shortcode:
[wordpress_file_upload uploadpath="uploads/copa" fitmode="responsive" uploadpatterns="*.jpg,*.jpeg" maxsize="2" duplicatespolicy="reject" uploadtitle="Apenas arquivos .jpg e .jpeg" selectbutton="Selecionar..." uploadbutton="Enviar!" successmessage="O arquivo %filename% foi enviado com sucesso." warningmessage="Arquivo %filename% enviado com sucesso, mas com avisos." errormessage="Arquivo %filename% n?o enviado!" waitmessage="Arquivo %filename% está sendo enviado..." requiredlabel=" (requerido)" notify="true" postlink="true"]

https://www.ads-software.com/plugins/wp-file-upload/