Finding and Copying an Object's UID

To find and copy an object's UID, open the page for that object. If the object has versions, go to the version you want. Then open the three-dot menu for that row, as shown below:

The menu is on the right side of the row. Select it, then choose Copy UID.

Projects and collaborators do not have versions. Open the object, then use the same three-dot menu to copy its UID.