Thank you for your outstanding support for this fantastic app! Snapshots offer a convenient way to preview bibliography entries by ⌘-clicking hyperlinks (e.g., [1], Alice et al.). However, in the current version of Skim, it’s not possible to copy text from the snapshot window, which makes it difficult to copy and search for reference titles. I hope this feature will be added in a future update.
That;'s not a bug, it is a feature.
This has also been rejected as a feature request many years ago.