Screenshot / Printscreen not being saved on dropbox file

  I have been using dropbox for years now and it's been the best for saving screenshots. However in recent years it started to not save them, and many times i had to manually copy and paste them to paint so i could save them.
I only managed to understand why this was happening in the past few months. As far as I noticed and have tested, the recent app version doesn't save the screenshot to the file, when you press the Printscreen button while running anything on FULL SCREEN MODE.
I have tested this in games, powerpoint presentations, navigator streaming and video programs. If any of these are in Fullscreen mode the dropbox app does not save the file.

I have tried to search for a solution here, but I could not find any...
has anyone experienced this? Is there any solution? How do I contact the App support team?

it may seems a 'silly' problem, but it's very annoying and even distrustful sometimes, when you need for it to be reliable saving what you need in a hurry (specially while playing games)  


please help :<


edit: i run the app on Windows 10. already reset the windows and installed everything... already updated every thing... this hapens in other computers as well.