Samsung Galaxy S6 — Upgrade to Samsung S6 screwed phone up!

I allowed upgrade of OS as I was constantly prompted to allow it. Big mistake, now I cannot download photos to hard drive through USB port. I take photos of damage for work and that very important feature is gone. I called Verizon and stopped by a store and the only help they could give me is to use drop box through cloud. Verizon acknowledged the upgrade is bad. Now what use to take minutes takes hours. I use to rank Samsung as the #1 smart phone, now I rank it at the bottom and planning to get rid of it. The upgrade made by Samsung is a big mistake.