Use ui explorer and find out the exact selectors for Choose file button and highlight via ui explorer so that you could achieve this by clicking the exact button not entire area.
Use different ui modes for indicate this element to capture choose file button.
Question from my end is it working attended and not working un attended means this the only step is getting timed out. Thanks.
I am providing you a worst case scenario Use Element exists indicating the Chose file window and if exists then part try attaching the window and inside the do container perform the click operation as mentioned by @kirankumar.mahanthi1 with changing different Ui modes
Have we tested the Click Activity on the right of the Choose File Button? The No File Chosen, we can get to know by Clicking Manually on it at First to Check if the Browsing Window Appears.