Read or write only photos
I am trying to copy my Photos library to an external hard drive. It is 140g. It get to about 395g and then a box pops up that says: "The Finder can't complete the operation because some data in "Photos Library.photoslibrary" can't be read or written. (Error code -36)" I need to find which of the photos or videos are read or write only. How do I do this?
Macbook pro