Searching by multiple filenames is especially useful when you need to batch edit a group of assets at once, and isolate them in your library.
To search by multiple file names, click Advanced to the right of the search window. This will bring up the Advanced Search dialog.
In the first dropdown, select Multiple Filenames. A field to the right will allow you to list all of the filenames that you would like to search for. Th maximum number of characters that this field can fit is 4000.
You can place entire lists here and separate each individual filename with either a comma or the enter key by placing each filename on its own line.
Select Search to run the search by those filenames, and you're done!