Create an asset containing multiple files

From WikiDocs

1. Having multiple files selected, right-click drag-and-drop them into the drafts inbox.

2. This will pop up an advanced menu where you can assign all the selected items as a single asset.

3. Once imported, complex asset will automatically gather associated files when reimported.

4. This keeps it simple for artists so they can simply drag in any one of the contained files and still maintain the integrity of the complex asset.

5. There will be a warning anytime an associated file can’t be found during the reimportation of a complex asset.