The way Get Files works is you provide the folder path and (optionally) a string pattern to look for in the filename (with wildcard * if desired). The entire list of files found in that folder (optionally matching the string pattern) will be output to a collection whose name you provide in the Outputs configuration. Then, to see if it is created today, you need to loop through the collection and read the Create Date field. You can then test to see if Create Date = Today() or not and proceed accordingly.
Copy File requires the source path and filename and the destination path and filename.
So if your intent is to copy today's files to a folder, for example, you do the following:
1. Get all files from the source folder into a collection.
2. Loop through the collection. Examine Create Date and if the date is today, then copy the file to the destination folder. If the date <> today, go to the end of the loop and look at the next file/row in the collection. Repeat for all rows in the collection.