Heyo! I can't figure out why this is happening? I make a custom block, here's a random example:

Texture, color, everything. Export as .obj into a custom folder for Assetforge and when I load the program to see my custom block:

Texture's totally gone??? Does anyone know why this could be happening?

Textures for custom blocks are not supported, you'll have to place them in the texture folder of Asset Forge and apply them in your model.