Photos on iphone

Hey there,

If you add photos to your iPhone, iPad, or iPod touch by connecting your device to your computer, you can't delete them directly from your device in the Photos app. If you see the gray Trash button  when you try to delete a photo from your iPhone, iPad, or iPod touch, you might need to stop syncing photos from your computer. Learn how to stop syncing photos from your computer.

from this article ☞ Delete photos on your iPhone, iPad, and iPod touch - Apple Support

"Photos on iphone: how to delete photos on my iphone that came from my mac? No delete option."

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Troubeshooting Un-Delete-able Photos:

Is there a cloud with a down arrow? If so, then know that these are not downloaded to your device. So, if you do not want to see these then disable Photos in iCloud, or compress it, making it a zip file.