If you have a file ready, you can import an existing Gliffy diagram that has been saved in .gon, .gliffy or .gxml format, or a Visio diagram that have been saved as .vdx files or .vsdx and exported from Visio (Gliffy v6.7 and above):
1. Open the Gliffy Start Screen.
2. Select Import a Diagram from the menu.
3. Click Browse to locate your file.
4. Double-click on your file to select it. You will then be launched into the Gliffy Editor.