Part 1: Delete Data in Android
Part 2: Clear Thumbnails in Android
Part 1: Delete Data in AndroidStep 1. Check Android Storage
Go to "Settings". Scroll down and find out "Storage". Then you can see the situation of the device memory, including total space capacity, system memory, used space, cached data, miscellaneous files, and available space. In addition, storage of SD card can also be checked, containing total space, available space, unmount SD card, and format SD card for example.
Step 2. Delete Files from Android
If too much storage space is currently used, selectively delete the files that are useless, for example, cache images, spam text messages, old songs, movies, etc. This will help you clear up your phone and solve the problem that "Android phone is in out-of-memory error".
Part 2: Clear Thumbnails in AndroidStep 1. Go to DCIM
Follow the path: My Files/Documents > Device Storage > DCIM > .thumbnails.
Step 2. Delete Files in ".thumbnails"
Long tap on ".thumbnails" and select it. Click the menu button (three dots at the upper right corner). Hit "Details" among the options. Then you can get some detailed info, including size, and contains. If the size is too large, select files in the ".thumbnails" folder and click "Delete" to clear them.
That's all. In addition, you can delete files and clear up your Android phone with one click using Android Transfer.