How do I import photos in to the Photos Library completely?
Restoring them to their original location is the best plan. Then use File > Consolidate (as suggested by @Tetsujin here) to ensure all items are copied into the library. Your settings (as shown in the screenshot in your other question) are set correctly for Photos to manage the library and the originals to be able to be removed from your hard drive. This time I would just rename the folder they're in and see what happens. That way you can quickly and easily undo it if it still isn't working correctly.

Unless you are referring to the Masters folder (within the .photoslibrary bundle) as the originals. In that case - leave the photoslibrary bundle alone. You cannot remove files from it and expect them to keep working in Photos.