When you view a BIM 360 Glue model it is added to your recent models for quick access at any time.
If you intend to access recent models when you are offline, enable the Keep Me Signed In option on the Sign In screen or download a model. If you are online when you select a model from the My Recent Models area, you access the latest version of the BIM 360 Glue model.
Standalone models are models that you have added directly to your device through iTunes® or that you have downloaded directly to the iPad. Standalone models are always available when you work offline. They are stored on your device and are not synced with BIM 360 Glue. Best practice is to use BIM 360 Glue to ensure that you always have the latest models.