dynamic url in file attachments

hello,

i would need to attach some different files to email.
in each post/site i will need to be another pdf-attachment
so i would be great if path for attachment could be set dynamically by slug of page ( = name of pdf-file as well )

example: uploads/pdf/[_post_name].pdf … does not work
setting name of one pdf works fine (uploads/pdf/test.pdf)

can anyone help ?

thanks alot

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