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It might be related to the apps installed,not the media files. Go to settings-apps-downloaded,how much free memory do you have?
It means more than 75% of the memory is full,that is the normal message you get. You cannot move apps to SD,you need to remove apps.
Yes,but not in the near future. You need to consider that some apps that you already have might expand their size after updates (just look at chrome or other google apps).
If you're using Android Kitkat (4.4.4), the only way is to root your device. This is my problem also but I don't want to root. Waiting for Android Lollipop, hoping that it will allow the app to be saved on SD.