[JeanC]

Hey, it works for me, like it says in the disclaimer: I have uploaded books, managed / edited / deleted collections and books and i have no errors anymore and all seems to work. Maybe it's useful for someone else too, that's all i'm saying. I included the c++ source btw.

Connect the kobo, start the app, choose upload books (F8), in the first dialog you can select books, the second dialog lets you either choose an existing collection, or enter a name for a new one. The app uploads the books and creates the collection(s).

Then you disconnect the kobo so that it can rebuild it's database with regard to the uploaded books, and it will show those books in the collections you made / edited. Very straightforward.