The Viewer status bar initially indicates that you are connected to 3ds Max:
As in 3ds Max, this message can be overwritten by further activity; but also as in 3ds Max, a persistent green indicator appears at the right end of status line:
The 3ds Max window becomes active again. While 3ds Max is updating the scene (which can take some time), a series of progress bars replaces the status line. For example:
At this stage, you can click Cancel to stop the data transfer.