Easy as 1,2,3!!! If you can’t delete photos or videos directly from your iphone it is because you synced those photos with one of your computers previously (or someone else’s computer). You may not have a trash bin or your trash bin is grayed out.
In this video I show you how to remove those albums from your iPhone (works for iPad and iPod too). You will need to connect to any iTunes.
Note that you will free up storage once these are deleted cause it is on your device not in a cloud.
If you still need assistance please comment below.
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Video credits to the YouTube channel owner