If you are renaming the files outside of Lightroom, you need to record the new and old names so that you can manually reconnect the files one at a time in Lightroom.
Obviously, the recommendation is to not do this renaming.
If the original file name is being preserved in the EXIF data, a program like ExifTool will let you get a list of the new and old file names.
Okay I understand!
Thank you ManiacJoe!
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If you rename files outside of Lightroom after they have been imported this is what happens. Either rename them before you import or rename then using Lightrooms renaming tools. If Lightrooms tool isn't good enough you could use this plugin by John Beardsworth. His plugins seem to be very good.