Check that the cable you are using is one that can transmit data. Some cables only have 5V power pins connected, which makes them good for charging low-power devices, but nothing else.
Also check the settings on the device to make sure that it allows USB connections. There is a security setting (see page 115 of the user manual) where it will not allow USB connections.
https://ss7.vzw.com/is/content/VerizonWireless/assets/userguides/samsung/basic-samsung-gusto3-ug.pdf
Page 75 indicates that the phone can share some photos via Bluetooth, so I don't know if that might be an option.