Vanilla Blender doesn't automatically reload external dependencies or refresh linked files on changes.
You have to manually refresh them yourself, either by:
- Reopening the current file to force refresh dependencies
- Going to File > Revert (be sure to save your changes first)
- Or opening an OutlinerOutliner, changing to Blender File mode from the header, and right-clicking aany linked file and choosing Reload.
Alternatively install the addon Auto Reload Linked Libraries by Gandalf3 to have Blender do it automatically for you.
Auto Reload Linked Libraries
A simple Blender addon which auto-reloads linked library .blend files when it detects that they have been modified.
Usage
This addon doesn't have a UI. Once it's enabled, linked libraries should just refresh automatically.