Been following this for a while.. Seems a lot of people can convert their worlds at this point.
Mine still crash at around 48% every single time.. I've tried the usual stuff, deleting boxes and various other things, taking out mobs and all sorts of things.. Nothing have worked.
My world is around 160mb.
I joined the beta program just to upload my world, and only got a confirmation that they got the world but won't be able to follow up (or something like that)
Mine too still fails to convert, can never get past 49%, and I try after each new update.
I've sent in the world twice, via the beta program, but no response.