Your own network card, mobile phone memory card, or software may have bugs.

You can check whether the network is normal and whether you can see other software pictures. If it is a network card, you can try another network. If it's not a network problem, check whether the phone's memory is occupied too much. You can clear the memory and restart it. If there is no problem, there is a bug in the APP. You can give feedback and wait for official notice.