Still searching.... I migrated my Apple libraries (still a bit screwy) and have found a ton of duplicates... want to try a thinning. Not worried if if fails as I have not deleted the Apple libraries but would like to avoid any additional pain in this process. Is there within Synology Photos...a method for this?....or must I put the big pants on on learn a new complex (for a semi-beginner) 3rd party or terminal process? Happy New year everybody ... or at least live long and prosper.