Camunda files manipulations

Hello Team,

I have many problems with file manipulations, so can you give me solutions and answers for this requests ( or one of them) :
1 - When i user Upload File where can i find the uploaded file to use it in other steps of my workflow ?
2 - Can i open a local or intranet Excel file from camunda form ?
3 - Can i open a forlder using path in camunda Form ?

Thank you