Bought four 4tb drives to replace the 500gb ones I started this journey with.
Replacing went OK, but HexOS would not recognise the 4th drives as valid replacements, so did it through TNS, which worked fine.
With all drives now replaced, pool is still showing the original 1.28tb of storage available (in HexOS and TNS).
Have I missed something? I thought replacing all the drives with increased capacity would increase the available storage. I could rebuild the pool but I don't really want to!