I expected that Resources is a kind of warehouse where I can put files that on the server are read by the RW-pages.
I placed a CSV-file into my Resources via RW, and linked it with the stack Table (CSV) - Foundry. Tehn I uploaded the project.
I guessed, when I place the updated CSV-file via ftp in the Resources-folder that the site page would be updated after refreshing it.
But it seems you can only update via RW.