You may try to R click on the folder (in the L LR column) and from the dropdown select SYNCHRONIZE FOLDER.
Please reset Preferences for both Photoshop and Lightroom.
*backup your Lightroom Catalog and Photoshop settings before resetting
Instructions on how to Reset Preferences:-Refer Recover catalog and images after resetting preferences and
Thankyou Vince. you are right this does work but was no usually necessary in previous versions. Thankyou for your response
Hi Akash, wow I will give this a try. thankyou so much for your help