How do get photos off my iPhone 6s on to a flash drive with no computer

So I don’t need a computer is what you were saying and I don’t need a lightning USB adapter

Correct, connect the iXpand Flash Drive to the iPhone.

What is the iXpand Flash Drive?

It’s a flash drive for your iPhone and iPad that also works with computers.1 Connect the drive to your iPhone or iPad with the Lightning connector to quickly free up space on your device, or use the USB connector to quickly transfer your photos and videos to your PC or Mac computer. To learn more about the iXpand Flash Drive go to www.sandisk.com/ixpandflashdrive

-> SanDisk iXpand Drive app - App Store

https://apps.apple.com/us/app/sandisk-ixpand-drive/id1079870681

👉 Easy to Use:

Connect the drive to your iPhone or iPad to launch the app. Once the app launches, you can set the app to automatically back up photos and videos from your camera roll to the drive. The app also makes it easy to watch videos or listen to music directly from the drive3. And the app lets you encrypt files for transfer and storage between devices2.

You can use a SanDisk iXpand flash drive to use as an external hard drive. They are available in various sizes.

You can also use that iXpand flash drive as a tool to save the photos to a real external hard drive afterwards.

iXpand Flash Drive are available at Apple Store and at Apple Authorized Service Providers.

iXpand flash drive app can be downloaded from the App Store.

See -> SanDisk iXpand-flashdrive Go 

SanDisk 64 GB iXpand Flash Drive Go - Apple

SanDisk iXpand Drive app - App Store

https://apps.apple.com/us/app/sandisk-ixpand-drive/id1079870681