Dears,
I have created a character using Daz Studio (I do not have knowledge in 3D modeling). Then, I export it to Blender using the "Daz to Blender" tool. And the result is what I was expecting:

But when I try to export it in .glb, the texture are not exported:

Is there an easy way to force the exportation with the textures? I tried to check on the internet but I always found video of more than 20 minutes explaining how to create a material that will be exported and this is not what I am searching for. There are a lot of materials already present and I do not understand the method.
For those who would like to have the files, blend file and glb files can be found here (6.11 Mo).
Many thanks in advance for your help.