I am using an LG V410 tablet running Android 5.0.2 and a Windows 7 Home Premium computer. The steps should be similar for other devices and operating systems.
1 Have both the computer and device turned on
2 Plug in the cable for the device to an available USB port, the computer should make the “USB device inserted.” Windows may need a minute to load drivers if this is the first time
3 If a Windows Explorer dialog box does not open, click on the Windows Explorer icon in the Taskbar or click the Start button, All Programs, Accessories, Windows Explorer
4 Under “Computer” / “My Computer” / “This PC” there should be a a device called “Your Device’s Name,” click on it. Some devices will allow you to change the name. My LG V410 is named “MissLamarr” after Hedy Lamarr
5 An icon marked “Internal Storage” should appear, double-click it. In this folder, you will see dozens of other folders. You might also find files in the Movies, Music and/or Books folders if you have downloaded those items. Please Note: Poking around in some of these folders can be disastrous.
6 Find the icon marked “DCIM,” double click it (I think it stands for Digital Camera IMages)
7 Then you should see a folder named “Camera,” double-click itYou should then see photos. From here you can select the ones you want with your mouse and using the
key to select a range or the to select each file and
then right-click on one selected file and click on Copy.
8 Click on the “Pictures” folder in the left pane of the “Computer” window.
9 If you need to, create a new folder and name it. Either by clicking the New Folder button, right-clicking in a blank area and selecting New > Folder.
10 In a blank area of the new folder, right-click and click Paste. Your file(s) should move from the device to the new folder. Continue until the files you want are moved.
11 Close all windows you no longer need.
12 Right-click on the USB Devices icon in the System Tray to eject the device. If one isn’t there, you can just pull the cable as long as both devices are finished with the files transfers. If unsure, wait a minute or two.
13 When transferring a large number of files, a dialog box will appear telling you the number of files and an estimate of how long the transfer will take.