I cannot transfer my photos to computer using usb

If you need to transfer photos from Samsung phone to computer, the most efficient solution is to use a helpful data assistant software.
You don't need to transfer photos one by one, it can save you a lot time on this thing. So, it is very effective for you to transfer photos between Samsung phone and computer.
Transfer Photos Between Samsung Phone and Computer

If you need to transfer or backup data from your phone to pc, some professional data backup programs are good choices for you. This android transfer app allows you to save a lot of time to transfer or backup text messages, contacts, photos, and other media files like videos, music files. How to Transfer Photos Between Android Phone and Computer

take pic on phone the email them to "yourself" then using computer open email save them to where ever you want to save too.

The easiest way would be to tether your handset to your computers USB port.






You can also pair a cellphone wirelessly via Bluetooth or wifi and transfer them that way

Try Android Phone Manager.
Here are some related articles you can follow:
How to Transfer Samsung Galaxy S7 Photos / Videos to Computer
How to Transfer Samsung Galaxy S3/S4/S5/S6/S7 Pictures to PC
Jihosoft Android Manager
How to Transfer Samsung Galaxy S7 Photos Videos to Computer
How to Transfer Samsung Galaxy S3 S4 S5 S6 S7 Pictures to PC

Quite easy to transfer computer pics to flash drive via Windows Explorer:

1. Plug USB flash drive and iPhone to computer. iPhone will receive a prompt to approve it. Approve it and iPhone will be automatically detected by computer.

2. Open Windows Explorer and head to "iPhone > Internal Storage > DCIM". A list of photos on iPhone will show up.

3. Hold "Ctrl" and select photos you would like to transfer to USB stick and press "Ctrl + C".

4. Create a new folder in USB drive or find a folder, then press "Ctrl + V" to transfer iPhone photos to USB flash drive.
If you're prone to find more effective ways to transfer computer pics to flash drive, just check out this tutorial:
https://www.leawo.org/tutorial/how-to-transfer-photos-from-iphone-to-usb-flash-drive-1361.html?=1400