Unsolved webassembly try

[CKurdu]

Hi everybody,
I decided to try webassembly with qt 5.13.1 and I have some questions.
I downloaded webassembly for qt 5.13.1 from Qt Maintenance tool and I followed this tutorial.

But qt kit gave me an error not compatible ABI. Qt maintenance has qt 5.13.1 webassembly 32 bit . I downloaded the 64 bit emsdk. I think that this is a problem and try to download 32 bit emsdk but I was unsuccessful.

If I compile 64 bit webassembly and a webassembly based program, does it work on any computery (32bit or 64bit)?

How can I upload files from a webassebmly and qml based program?
Is drag and drop files from the client computer possible?

Thanks.