I cannot delete photos nor see videos on my iPhone XR
Why when I try to delete my photo and it still there, and when I try to see a video , I can’t see it it just like freezes
[Re-Titled by Moderator]
iPhone XR, iOS 13
Probably you have synced these Photos from your Mac/PC though iTunes. Un-sync then they be gone.
Un-Sync photos to your device
- Connect your device to your Mac.
- You can connect your device using a USB or USB-C cable or using a Wi-Fi connection. To turn on Wi-Fi syncing, see Sync content between your Mac and iPhone or iPad over Wi-Fi.
- In the Finder
on your Mac, select the device in the Finder sidebar. 
- Select Photos in the button bar.
- Note: When iCloud Photos is turned on, no photo syncing options appear when you select Photos in the button bar.
- Select “Sync Photos to your device from” tickbox, then choose Photos, Pictures or a folder from the pop-up menu.
- Uncheck Sync photos
- Click on Apply / Sync