I am not familiar with Photoshop, but I am sure that you can reduce the image size with this programme; most photo programmes have this facility. You select the output size you wish.
Irfanview is free, and does this easily
OnePlus 5 review
Alice Saey's mesmerising animation for Dutch singer Mark Lotterman
iPad Pro 10.5in (2017) review
Comment booster votre iPhone ?