HomePage Show recent documents from olher subsites.

Hello, 

The struct of my site is this: 

HomePage(Site)

     Tax (Subsite)

     Accounting (Subsite)

I´m trying use the app webpart "Recent Documents" to show the recent documents used in Library of the subsites on my homepage but it only show me the recent documents of my homepage Site. How can i show the recent documents of subsites?

It is possible to define the types of documents to show, for example i don´t have interest to have in list  page(urls) but only docs, pttx pdf...

Thanks for help.