I haven't used RP for ages, but there should be some option to search for files to add to the library. Find that option & then you need to search for LW's saved folder...add files to RP from your saved folder.

Go to LW's library & click on your saved files. Highlight a file & click Explore...your saved folder will open outside of LW. Or in LW tools >options > saving will show you the location of your saved folder. That's where you need to add files from, when adding to RP's library