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I thought I understood convoys, but I keep having situations like this where an army can't move, but I don't see a reason why. In this case it has support and no opposition. Can you not attack via convoy even unopposed?

Was F ENG given the order to convoy from GAS to BEL ?

... from WAL to BEL ?
(sorry)

From your screenshot it seems you ordered F NTH convoy A Wal Bel, which is redundant but legal; and instead forgot to enter the necessary order, ie F ENG convoy A Wal Bel

Wales is not adjacent to NTH therefore the convoy requires the participation of the Fleet in ENG, which you did not order.

I was under the impression it was using the fleet in ENG as a convoy. Is there another step?

Oh, I didn't realize the blue dashed line. Ok, I have a better idea of how convoys work now. I really wish there was a better tutorial.