I have the same issue and having a hard time believing no one else is....I keep my photos on a remote server and have been able to import to iPhoto and then Photos running on the Mac but saving to a network file mounted library from iPhone this way for years. Same behavior as above, Photos attempts to import a few dozen to hundreds of photos in a few seconds but nothing shows up. Copying the photos library to a removable HD and attachig directly to Mac appears to be a work around but won't work for me long term. Any insights/help Apple?