When a 3dm model is opened and Rhino detected the external files of embedded and linked blocks are modified, the Block Definitions to update dialog appears for actions.

Block Definitions to Update

Name

Displays a list of block definitions in the model.

Link Status

Displays the status of block instances linked to external files.

Link File Name

The name of the file that was imported to create the block definition.

Select All

Selects all block definition names in the list.

Clear All

Clears all block definition names in the list from the selection.

Update Later

Updating the block definitions is postponed until you update manually or reopen the file.

Update Now

Updates all of the selected block definitions.