library merging

I'm pulling my hair out. called Apple about this but got no help to resolve. I use imovie for basic editing of my clients' oral history interviews, and somehow ended up with more than one library, and media and events in both libraries for this same project. I don't know if that's the...

Hello, Photo is not at all my photography main app but it comes handy at importing off of the iPhone, I just figured it out that on my backup MacBookAir I have two Photo libraries and was trying to find out how to merge them in a single one as to save space (there probably are doubles) and to...