The following Tutorial helps you create a texture palette inside ARki app to showcase material options.
From ARki 7.0 you can import several textures into each scene to showcase material options
How to create a material palette
1: Select Material button and then start selecting the meshes to texture
2: Touch and hold the texture palette to add new textures into the scene
3: Import JPG or PNG files below 2mb, smaller than 2048 pixels wide
4: Repeat the process for every texture option, and for every layer
Model credit: Nextgen railway footbridges by Network Rail Buildings and Architecture