Refer these tutorials for the correct process of transferring :
If that does not help, could you please explain the situation so that we can assist you further.
Chetna I want to thank you for the quick reply. What happened is I had LR on my laptop and stored my photos on and external drive as the internal drive was to small for my files. I then realized that if I was to send the catalogue to my desktop I would need to have the catalogue on the external drive. It was during that process that I have run into a problem in that I cannot seem to get all the photos and the catalogue matched up to do the transfer. I really do not know what I did wrong other than I know I need help.
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Have you transferred over the correct catalog?
Are all the images in catalog stored originally on your external drive or some of them are from internal drive of laptop as well?
If that transferred catalog does not contain all your edits then, you should probably transfer the catalog again.
On your laptop, launch Lightroom > go to Catalog Settings > general tab > check the location of the catalog mentioned there
Go to that location manually and copy .lrcat and Previews.lrdata files to the external drive