Appsync and File use ..

HI experts ....

I just wondering that why Appsync supports NFS only ? and anyway ,,, Why NFS ( file environment ) need to use Appsync ?

As NFS does make some application consistent points itself ...

Also not sure why SMB cannot be supported by Appsync ....

Please somebody advise me about FIle and Appsync use ...

thanks

aya