Hi True_Breed,
For help with thumbnails showing on your iPhone, test the steps below for a normal restart of your iPhone. Restart your iPhone
"How to restart your iPhone X, 11, 12, 13, or later
- Press and hold either volume button and the side button until the power-off slider appears.
- Drag the slider, then wait 30 seconds for your device to turn off. If your device is frozen or unresponsive, force restart your device.
- To turn your device back on, press and hold the side button (on the right side of your iPhone) until you see the Apple logo."
If the issue continues, test loading the content on a different network. Connect to Wi-Fi on your iPhone, iPad, or iPod touch
Cheers.