Adobe Animate CC (2018) is not asking me to replace library items

Hi mate,

There is a change of behaviour which was introduced some versions ago.

I would suggest taking a different course of action:

Instead of copying from Library to Library, select the Library items and drag them onto a frame on the Stage in your source file.

Then copy this frame and paste into a frame in your target file.

The Resolve Library Conflict dialog should now appear and you will be able to replace items that have the same names and paths.

Delete the temp frame.

Hope this helps!

the same named items should be in different folders in your library so they're both available to you, but the current has the same options to resolve library conflicts that previous versions had:

and even though it sounds like you're using an older version, i don't recall this option ever changing.

if you don't see that you can reset your preferences or, even better, update your animate.

https://helpx.adobe.com/animate/kb/animate-cc-crashes-on-launch-startup.html
(or remove Win: C:\Users\\AppData\Local\Adobe\Animate CC \ and
C\Users\\AppData\Roaming\Adobe\Animate\\
Mac: /Users//Library/Application Support/Adobe// and
/Users//Library/Preferences/Adobe/Animate//)