iMac Late 2015 - Mid 2017 ram and SSD upgrade

SSD & RAM Installation Videos - iMac 27-inch with Retina 5K (Late 2015 - Mid 2017)

Model ID: iMac18,3 | iMac17,1

Memory Install Video
OWC Skill Level: "Easy"
Duration: 2:19

How to Upgrade or Install a SATA Drive (SSD or HDD) in the Main Drive Bay of a 27-inch Apple iMac (2012 - 2019)

Ram memory and SSD for imac18,3 check link below: