Just bought a realm, having this issue on switch v1.18.12 with physical game cartridge.
Previously had issue REALMS-474 16 months ago, have never successfully exported a world from a switch.
Same issue still for me on v1.16.21 on Nintendo Switch using a physical game cartridge.
Error box says “An Error occurred” and then “level export failed” and realm is not replaced.
Will this ever be fixed?
No change in 1.18.30, still cannot upload to realm from Switch.