Error replacing world on Nintendo Switch

Hi

I have setup the 30 day trial for Realms, and to test I would like to migrate my World on Nintendo Switch to my PC.

On the Switch, I go to "Edit Realm" then "Replace World" and select a world (have tried multiple btw)  and at this point we get a generic error message : Level export failed : An error occurred.

How can I get this to work on the Switch

Thank you so much