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ArmA 3 Terrain Builder, ArmA 3 Terrain Builder Support Forum

When you have multiple Terrain Builder Satellite Texture / Mask Images to import, for example if you split them into tiles, you can import multiple at one go by holding SHIFT-LMB and selecting all the BMP satellite texture or mask images.

Remember that if both textures and mask images are in the same dir (as they usually should be?), don't just hit CTRL-A to select all files, only select what you are importing, you have to import satellite texture and satellite mask separately, so know what type you're importing.