Transmission

I have docker with a transmission container. (Consider me in the learning phase. Although I never leave that phase.)

From within the console of the container in Portainer I run:

transmission-create -o ~/uploads/My_Book.torrent -p -t <announce_url> ~/books/My_Book.epub

The response I get:

Creating torrent “root/upload/My_Book.torrent”
ERROR: Cannot find specified input file or directory.

I have also run:

transmission-create -o /uploads/My_Book.torrent -p -t <announce_url> /books/My_Book.epub

Same results.

I am uncertain how to manage the files paths? (In the compose file for transmission I declare /uploads & /books locations.

I am very open to suggestions and education.