When I do an update from Core for my collection amd receive the end result, sometimes it will tell me certain number of comics are not in system (for whatever reason, change of series title etc.) How can I find these issues that are not connected?
What @Reinharc mentions is indeed the way to find unlinked comics and link them.
But your topic title says:
“Not in database”
and your message says “not in system”
What is the exact error/notification you’re getting? (Just wondering because we don’t want you to follow instructions for a different notification you’re getting / and I don’t want to assume what notification you’re getting!)