Can someone please help me thanks! https://www.the-blueprints.com/blueprints/modernplanes/boeing/19885/view/boeing_747-300/ this is where I got the image from
Background images are only visible in Camera View or in the Preset Ortho views along an axis.
Numpad 0 for camera view
Numpad 5 : shifts between ortho and perspective view
Numpad 1 : front view
- Numpad 3 : right view
- Numpad 7 : top view
- Ctrl+Numpad 1 : back view
- Ctrl+Numpad 3 : left view
- Ctrl+Numpad 7 : bottom view
Background images only show up in camera view or on your Top, Bottom, Left... etc views, and you also have to be in orthographic mode. To see the background image you need to switch to one of those views, and then switch to ortho mode by pressing 5 on the numpad or by pressing View Pers/Ortho in the view menu.