Search for the collection of interest, as described in Searching for Collections - 2021-10-18.
Click the edit icon for the collection you want to modify. A tree view and information panel appear.
Select Download Collection Command > Add Components from Cart. A dialog box appears, listing all items in the cart.
Select one or more items from the cart. Click Add. (Do not press Enter or Return on your keyboard.) The system adds each item you specified to the collection. The system also displays a confirmation message at the top of the page, indicating how many items you have added.
In the tree panel, click Download Detail. The system lists all of the items that you have added to the collection.
To request download of this collection, refer to Requesting Generation of an ALS for Download - 2021-10-08.