There are two methods due to the different Android phones.
Method 1:
1. Plug the flash drive into your Android phone, check the top of phone for the USB symbol, it says “USB storage” connected. Go to "My Files" to select the pictures, videos or audios you will see your files there.
2. Click on “Copy” or “Move” by breaking down menu on the top right corner, then go to the folder you want to move your files to. At the top/bottom you will see 'Paste Here', once you do that, your files will be copied or moved to that folder.
3. Glide your finger downward on the phone's home screen to display the notifications panel to back to the “General USB Drive” to eject or uninstall usb drive.
Method 2:
1. Connect the USB to your Android phone, and glide your finger downward on the phone's home screen to display the notifications panel
2. Tap the information as "General USB Drive", “USB storage” or “OTG” alert, you will see some existing folders.
3. Click the folder to open the files, choose the files to “copy to” or “move to” the folder you want to. Glide your finger downward on the phone's home screen to display the notifications panel to back to the “General USB Drive” to eject or uninstall the usb drive.