| identifier | A unique identifier associated to this sub-Asset. |
| asset | The Unity Object that is the sub-Asset. |
| thumbnail | An optional 2D texture to use as the tumbnail for this sub-Asset. |
Adds a sub-Asset to the result of the import operation.
The sub-Asset is not a child of the main Asset, but a different Asset that was created alongside the main Asset. For example: when importing a texture as the main Asset, a sub-Asset could be a sprite. Note: You must make sure that your importer creates a unique identifier for each Asset. You must also make sure that your code regenerates the same identifier each time the file is re-imported, even if sub-Assets have been modified. This allows Unity to keep track of which old sub-Assets have been modified when a file is re-imported, and therefore which should be replaced by the corresponding new versions of the same sub-Assets. The identifier only needs to be unique within the context of the Asset file and not globaly unique across your whole project.