Help to export OBJ with textures

Please help! Am a traditionally clay sculptor but I’m trying to make use of my xmas present in a new iPad and Nomad. I’ve done a sculpt, textured and coloured it and have sent it off to someone who has access to a colour 3D printer. He say’s he needs it in an OBJ but when I send it to him he can’t see any of the textures or colours. When I send it as a GLB he can… but he can’t print off in that format.

If there a way for me to export it in OBJ and to make sure it includes all those details?

I guess, you painted it in nomad?
Paint in nomad is different from painted OBJs.
In nomad you paint vertices, for OBJs you have a .png, a different one for colour, metal, roughness…
So you have to transform or „bake“ the colours from nomad to a png. You can do this in multires menu, the one tab after multires, voxel, dyntopo, XXX (I‘ve got the german version, so I don‘t know how it‘s named in English). Before you can do the „banking“ you have to create the UVs, you find it above baking.
Check Textures when exporting as OBJ.
Hope this helps.