Uploads to the public web applications are limited to 80MB (noted at the bottom of the web page). I’d imagine that the Harbour Seal genome is on the order of gigabases. You won’t be able to upload it to the public web application.
Installing a local copy of the MEME Suite would allow you to use whatever data sources you like. The easiest way to install a local copy of the MEME Suite software is by using the provided
Docker image. This does require installing running Docker on you local machine. The other options for installing a local copy are described on the
download page. The instructions for compiling the software locally are
here.