1. Method 1: Build Mode

1.1: If the model name and model file location are unchanged since the last import, please click on the Object toolbar followed by the Place Mode tab in Build Mode.

1.2: Click on the small circular Object Icon of an Imported Model. Use the Arrow Up and Arrow Down keys to cycle through overlapping Object Icons.

1.3: Click on the Re-Import Model button to re-import the selected model. The file name and location is displayed when the the mouse cursor overlaps the Object Icon.

1.4: If the model name or model file location has changed, hold down the ALT key and click on the Re-import Model button in step 1.3 to manually select the location/name of the file. The file name and location is displayed when the mouse cursor overlaps the Object Icon. 

2. Method 2: Material Editor

3.1: If the model name or model file location is unchanged since the last import, the following function will re-import the model:

Edit Materials Mode -> Context Menu -> Material Properties button -> Reload model

3.2: If the model name or model file location has changed, the following function allows you to manually select the location/name of the file to re-import:

Edit Materials Mode -> Context Menu -> Material Properties button -> Reload model from a new file