Support site for the phone is here, https/www.verizonwireless.com/support/gusto-3/ along with the user manual. You will probably need to install USB drivers for it on a computer and copy the files that way.
There is a note on the Verizon support page about the Gusto though, so you may be out of luck, unless you can email yourself the files
Transfer Pictures or Videos - Basic Phones
These basic phones don't support the transfer of pictures or videos.
LG Terra VN210
LG Revere / LG Revere® 2 / LG Revere® 3
LG Accolade VX5600
Motorola Barrage V860
Samsung Haven SCH-u320 Samsung Gusto SCH-u360