The latest iOS update introduced a new image format called High-Efficiency photos. These images are not compatible with most Windows devices. As a result, High-Efficiency photos entered into iPoint will not show up on all devices in your company.
When you look at the media list, a High-Efficiency photo will not show a thumbnail, as illustrated here. The top photo is a “Most Compatible” image. The bottom photo is a “High-Efficiency” photo.
Here is the solution
On your iPhone, go to Settings > Camera > Format and select Most Compatible.
This will ensure the pictures you are taking on your iPhone and uploading to iPoint will be visible for all to see.