Aug 07, 2019 06:37 AM|Yongqing Yu|LINK
According to the picture you gave, the states of DSC_0013.jpg and DSC_0066.jpg are 200, which means that their URL is right, but in the preview tab, the two pictures themselves are the same, except that you define different names for them.
I hope you can confirm that your source is correct and that you can see the difference between the pictures, because there are no errors in the information you gave, except that the pictures look the same, which
may be why you click on the trigger picture and it doesn't seem to change.
If you know that you have two images that look different, you can test them again.
It is recommended that you use code behind to debug through breakpoints to confirm that every time you click on list item, you will enter the OnSelectedIndexChanged event and get different image urls each time,
but only if you ensure that the picture looks different.
Here is my test with breakpoints: