Thanks for the info, but the size increase is worrying.
With 14.4GB of available storage, one map taking 8.3GB seems wrong. If I total the 8.3GB for the 2018 cycle map, 2.3GB for the TopoActive EU East, and 3.4GB for the TopoActive EU West this gives 14GB which leave pretty much nothing for anything else even if I were to delete my 1.6GB of OSM maps.
There has got to be something wrong with am 8.3GB cycle map on a 14.4GB device.
How is it possible to understand the match between files and maps? In other words how do you link filename (file with extension img) with map type (Cycle map, TopoActive East...)?