u/Alarmed-Wave6883

Me and my friend went out for the night and took way too many photos. I plugged my camera into my phone and imported them from my camera to the photos app. Once imported I get the notification saying “do you want to keep or delete photos from attached camera” pressed ‘delete’ to free up that space on my camera for more photos but now there’s a ton of blanks/place holder “photos” that I would still need to manually delete off the camera

How would I go about deleting these place holders, or is there an easy method right in front of my face that I’m overlooking?