Is your suggestion for improvement related to a problem? Please describe.
Users will likely wanna open the file they exported as soon as possible, it's common among other applications to have this feature so implementing it will improve user experience because users expect it

Describe the solution you'd like
solution 1: show a notification bar with a button to open the directory where the file was exported (Like Typora)
solution 2: open the exported file immediately (Like MS Word)

Additional context
Screenshot from Typora