Problems with attachment

Hi,
I’m triying to attach a pdf file with contact form 7. Pdf it is located on my library on wordpress (inside wp-content folder). I use mail tab to attach on “Attached files” section so i entered “uploads/2020/11/Brochure.pdf”. The problem is when an user tries to submit form it ocurss an error (Sender message sending failed) message.Any solution?
Thanks for attention!