There is a possible issue when trying to move photos between your OnePlus One and other devices via USB. It is the case that on occasion the phone does not recognise the device it is connected to, even though it will connect to a laptop to charge. This problem is easily corrected however, simply navigate to ‘settings’, then select ‘storage’ and in the upper right corner there should be three dots indicating there’s a setting. Tap that icon and see if you can tick the box of the MTP connection there. This should set the OnePlus One to recognise the device connected to it.
It is always of course possible to use Bluetooth or other remote means to share files from your One Plus One but for those who prefer USB, this is the way to configure the arrangement.