Slitherine

After clicking on the classified folder, I see Grand Campaign '45 (my only grand campaign). However, only the first of 14 scenarios is visible - Goldap. I played Goldap at the first level of difficulty (sergeant) and scored a decisive victory. However, I expected to see the second scenario, which I don't see. I admit to being experienced with the campaigns, having never played them - only scenarios.

Welcome.
If you want to continue playing your campaign you just have to download your last save. If your last save was in the end of the first scenario then you'll be proceeded to the beginning of the second scenario.
If you want to play them as isolated scenarios then take a look at this thread:
viewtopic.php?f=121&t=30695

Thanks. I did not key in on the "proceed" button, having never played a campaign before. I see also there's a campaign tutorial.