To create or add assets to a group asset:
Click the triangle in the top-left corner, for each asset you wish to place in a group asset.
A tick icon will then appear, indicating that you have selected each asset.
In the top-right corner of the screen, click the Bulk Actions icon . The Bulk Actions icon shows you how many items you have selected.
The Bulk Actions panel will then appear on the right-hand side of the screen. In the Bulk Actions panel, you will see a list of the assets you have selected. Click the Add to Collection icon.
To create a new group asset with the listed assets, select the icon.
This will present a pop up where you can define the group asset name.
To add the listed assets click the + symbol
Click Create to finalize.