Why are large files created by Lightroom in User folder?

Hi - i ran out of Disc space yesterday and after a hour of searching found i had nearly a 1TB of data of files in the following folder

\\alan\Library\Group Containers\group.com.apple.coreservices.useractivityd\shared-pasteboard\archives The files in this take the following file naming 1D6146F1-231A-40B0-B94F-E0BA545FD5E5 - this one was created yesterday and is 50gb in size. I had idea where it was coming from but i’ve just opened lightroom and had activity monitor open at the same time and Lightroom created another file 50gb in size anyone had this problem ?

[Re-Titled by Moderator]

Original Title: group.com.apple.coreservices.useractivityd