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I cannot find DocumentUI App or File app which is used for file transfer between apps and sys in MIUI 9.3 by xiaomi.eu 8.2.1 for Mi 6. When I tried to export files in Dropbox app, sys says DocumentsUI not installed. I cannot find Document App or File app in sys setting-installed apps-show all apps.

I use the default launcher with theme limitless. The icons are listed 6*4 in the home screen except for the docker. But sometimes after I rebooted, the icons are listed 5*4. It is very strange and annoying.