Using Buttons with file or folder operations

Dear All,

as rather new with PBi, I have managed to load from a directory multiple excel files with multiple sheets into PBi and visualize data. The PBi tool I a want to create is meant to be deployed to the organisation and people shall be able to define the directory of their excel file as they want. For this pupose I created a parameter for folder name [SetFolder] made the queriy dynamic by this. I can modify this paramter by Menu item [Data transformation]- [Modify Parameter]. Then I can paste a folder path into the paramter field and off it goes. So job done but user experience is bad, as I know I will always receive questions about how to select an individual directory, as users will not have deep knowledge about PBi . 

Question:

I would like to have a kind of button on my rport sheets, that will open a folder dialog allowing select a folder and returning as parameter the folder which can be asigned to the paramter SetFolder. Then users can press update.

I have even no clue whether this is possible at all in PBi, maybe with DAX or so, but could not find anything anywhere.

Any idea? 

Thanks