Can I duplicate a set of files in LrClassic and keep their develop settings?

I'm trying to replace the synched originals I have in the Cloud with re-uploads from my hard drive so that Smart Previews reside in the cloud thus saving space. The originals are downloads in LrClassic from images which were originally uploaded to the cloud in LrMobile and edited while I was travelling.

The method I have been using to swap out  these Originals in the Cloud with Smart Previews uploaded from Classic was recommended to me on this forum. I unsynced the images in LrClassic by removing them from All Synched Photos , causing the originals in the cloud to be deleted. Once deleted, I am then trying to resync them from LrC and upload the Smart Previews to the cloud.

However, I'm finding that after I've removed images from All Synched Photos and then re-added them to the Synched Collection in Classic, they won't re-upload but get stuck.

I have found however that if I make a copy of the Original file in a different folder and synch that it uploads easily and quickly. Trouble is, the copy loses any previously made edit settings after copying so these settings have to be laborious copied and pasted  from the first original image-by-image as I can't find a way to batch copy individual edit settings.

Any tips as to how I can do this? Is it possible to transfer a lot of individual edit settings from one set of image files to a set duplicated elsewhere or else make a copy of a photo in LR (actual not virtual) which also copies any pre-existing edit settings?