Problem uploading files and folders on tablet

Hi, I bought tablet Lenovo Ideatab S6000L and installed Airdroid yesterday.When I try to upload files (doc, pdf, jpg...) and folders from my laptop to the tablet using Chrome, I get an "error" message and I cannot upload anything.When I use Firefox, I can only drag and drop files, but not folders (when I try to do that, I get a message which says that drag and drop is non supported on this browser).
I use Android 4.2 JB on tablet and Ubuntu 12.04 on laptop; I sign in through web.airdroid.com.

Thanks.

I have a similar problem - airdroid tells me, that it cant's get connection to my lenovo S6000
Why is there no answer on the question above and

when will it be possible to get connection to a S6000 ?????