After Effects
Files inside a composition or a folder will not be displayed inside the Link Manager
Premiere Pro
Files inside a composition or a folder will not be displayed inside the Link Manager
Illustrator
Local assets cannot be <Linked file> or <Image> since it will break the Link Manager
Photoshop
The files within the Link Manager are smart objects and cannot be modified if they need to be visible in the Link Manager. However, assets within the active document can be manually converted into smart objects in order to be displayed in the Link Manager.