I am now using Blender 2.8 and create my own model, I add a new material and
link an image texture node to its color channel. However, when I try to export it to a collada file, and reimport it, the image texture disappear! It works only if I use Principled BSDF shader, it fails when I use other shader types such as Emission shader.
So what is the proper way to export materials to collada file, or is it possible to export image textures correctly?