Currently MatterControl supports only adding in multiple objects from file, not from within MatterControl itself. To do this, you would: Save a file to the Android file system. This can be done by downloading a file from the browser, importing from SD card, etc.Select the first model in the QUEUE and view it in the PREVIEW pane.Click the 'Insert' button at the bottom left of the 3D VIEW pane.Choose the file from the file system and click 'Open'.The model will be added to the 3D VIEW and can be moved, edited, etc.We're working on adding models from within MatterControl (i.e. QUEUE or LIBRARY); hopefully this functionality will be available in the next version or two.