Welcome !!! I believe it is possible to do so from the phone. I'll be right back and edit when I find it.
Use the menu (3 horizontal bars) button on top left
Press "people" near bottom
Press your name on top. It will open your profile.
Top left is photo area. There is a camera button. Push that and it will take you to you photos on device.
Choose from there.
Sent from my iPhone using Aquarium advice.