I recorded myself reading a couple things for my kids yesterday. The total video length for 1 video was ~10 minutes. Today I went to look at it and the recording was split up into 4 videos. 3 of length 2:50 and 1 with the remainder ~1 minute.
The second video was just under 5 minutes and it wasn't split up.
In the past I've recorded videos > 15 minutes with my phone and they still exist on google photos full length.
Did something change in the past few days and, if so, can I put it back? ( I wonder if this has something to do with the closing of Google+ as I believe the auto-backup feature originated there.)