I have the device: I can easily (via USB cable, via cloud or directly via the Tolino web browser) load any purchased books or PDFs or books borrowed from a library onto it. However, the integrated shop is Orell Füssli, i.e. if I want to buy a book via the shop on the Tolino, then it is with Orell Füssli. Likewise, the login for the cloud is via the Orell Füssli account, i.e. it is almost mandatory (the sentence before says "The tolino shine 3 cannot be linked to the Weltbild account").
Normally, the Tolinos are delivered with either Orell Füssli or Weltbild in Switzerland... but that doesn't limit you, because you can connect several bookshops to your Tolino. Simply go to the menu and select "My accounts". Then click on "Library link" and you can register Weltbild or other accounts. Weltbild.ch/weltbild.de and weltbild.at are listed there. Select your shop and log in with your shop login data. You should then be able to synchronise the books on your Tolino. Please note that you need to connect your Tolino to the WLAN for this to work!
Thank you very much for your message and your interest in our product range.
At the moment we at Galaxus.de can unfortunately only offer shipping within Germany. I regret very much not being able to give you a better answer and hope for your understanding.
You will also find books in Italian, but we have no information on the actual quantity available. It is likely to be the same problem as in other stores.
I don't have my Tolino at hand right now, but this should definitely work. Here are the instructions: https://mytolino.ch/faq/tolino-bibliothek-verknuepfung-fuer-tolino-lesegeraete-mit-verschiedenen-tolino-buchhaendler-kundenkonten-anlegen/