Huawei gallery pictures not loading?

I was just working on frames for animation for a school project for hours, and when I finished and looked at my gallery it looked like this. The images do not load. Pictures that were in my gallery before load again. Please help. (Huawei Matepad T10)

I would restart and charge the device and close the tab.

I've already done it but it didn't help.

Shame😯