Loss of Lr / folder / collection synchronisation with iMac and Lr v12 upgrades
I have just had my iMac upgraded with a SSD drive and additional memory. During this process Lr v12 was installed and the Lr cache was set to the residual flash drive on the original Fusion Drive of the iMac. When I got it home, I opened Lr Classic and the Folder structure and collections were an very old version of the structure, with many folders and photos showing as missing. This did not reflect the Lr v11 catalogue or my folders / collections prior topugrade. After reading around I could only find one possible solution and that was to synchronise the folders with the new catalogue. This required a re-import of the folders and many photos. This was successful but although the photos retained my Lr edits the Develop history was lost (it just showed the new import date). Is there a way to rectify this and get back to my original folders and collections along with the Develop history of the files? I am not confident enough to roll back to the earlier version of Lightroom / uninstall v12 and reinstall v11 nor to just try .loading the last Catalogue. Any thoughts?