Moving photos AND iPhoto library to external hard drive.
When I upgraded to Yosemite, I migrated my iPhoto library to Photos. I now want to move my Photos library to my external hard drive to free up space. I did this by dragging the libraries from my Pictures folder and then following the instructions to create a new Systems Library. However, when I open Photos I only have the pictures that I have taken since upgrading. None of my iPhoto library is there despite being migrated.
How do I get all of my photos in to one Photos library on my external hard drive?
Thank you!!
MacBook Pro with Retina display, OS X El Capitan (10.11.3)