Beginner Level 2

Hi, my Galaxy J5 show a huge usage in 'other files' (14GB). How can I clean that up.

I have removed and saved already all my pictures from my phone, I have uninstalled and re-installed Messenger&Facebook. Was able to free a bit, but don't know what kind of data is using so much space?


Anybody idea and can help.....I have  of course done the simple 'Device care' things.