details:

1. the company server is divided into test environment and formal environment. The difference is that the test environment is http formal environment is https;
2. android Wechat saved the picture successfully in the test environment, but failed in the formal environment.
3. ios can be saved successfully in both formal and test environments;
4. Picture is a picture directly generated by the API. The image code is as follows. The image is displayed with a set width and height:

for answers, thank you!