How are you creating the glTF? If it’s in Blender, you can select which objects to export and export only those in each file.
But I don’t think this is what you want if your goal is animation. You might try the solutions discussed here: GIF as animated texture? - #2 by Mugen87
Alternatively, if your meshes are given names, you could just hide all but the one “current” mesh, and every frame you do the same, showing the next mesh that should be displayed. This is assuming your glTF file contains one primitive/mesh per texture that you’re displaying.