New comment: I use most Google service intensively. If Google is a chain, Google Drive is the weakest ring. It just provide network level and very basic file level security. It provide no options for controlling the permissions of view, read, write, add independently. Its development is too slow and on wrong priority. Security should ever be the top priority.
Can't open files since few months ago! It says i need to check the internet connection, but i have connected to wifi or mobile network already. I have also updated the apps, but nothing change. Please fix the problem.