Cannot delete my iPhone7+ pic originally created on my Android SSGN2 & imported into my iPhone7+

Hi,

I imported a picture taken in 2015 on my Samsung Galaxy Note 2 into my iPhone7+ when I got it in November 2017.

Now I want to delete this pic.

I can't.

In my iPhone7+ I tap Photos, tap Photos, tap Select, tap the pic I want to delete and I get a check mark on the pic but . . . the trash icon in the bottom-right of the iPhone's screen remains greyed out.

I've tried connecting my iPhone7+ to my Mac, opened iTunes, selected my iPhone7+ and . . .
there's no Photo's folder under my...

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