How do I access my back-up from a previous device (Iphone6)?
I need to access photos from my iPhone 6 that I no longer have but have been backed up on that device.
iPhone 6s, iOS 10
Backups - Locate backups of your iPhone, iPad, and iPod touch
If you were syncing photos with iCloud, have you signed into Settings/Your Name/iCloud using the same Apple ID, and turned Photos syncing on?