Client event API

[Xsterik]

Hi,
In a first time I would like to thanks for this bundle, I'm using it with symfony and fosCkeditor and it's works like a charm.
After I don't know if it's the best place to ask these questions (here, on issues or stack overflow...).

Well my questions are about the original elfinder api, how to get the moment where elfinder uploads files in the harddrive for example...
I saw it's possible with the original elfinder (https://github.com/Studio-42/elFinder/issues/1467) but I don't know how to access to the api uploads, if I have to do it from the elfinder.full.js, a script of mine or from somewhere else.

And another question is can we preview only a predeterminate type of file when using differents connector ( like one show every type of file and another only show images (png/jpeg...)).

I try to find answers to my questions by myself from several days from now but I'm kinda lost.
If someone can enlighten me I will be gratful.
Thanks!