You can use the Collection Filler also when just insert your in-game name and leave the field for your collection props empty.
However to receive the best result (also with a comparison of your currently used props in collections) you have to upload your current collection props. Please follow the instruction:

• open Upland
• F12
• open the menu in Upland
• select "Collections"
• select "network" in the developer console (opened with F12)
• search for 2 requests with the name "coll-prop"
• one of it has under the tab "preview" some data
• right click onto this data and "copy object"
• insert into a text editor, e.g. Windows text editor
• replace your user-id with CTRL+H everywhere in your file with your Upland in-game name
• copy the whole data from the text editor and insert it on this page into the textarea "Your current collection props"