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Dear respected Simran Rathod,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
I’m sorry you’re having a problem with uploading pictures in Lists app in iOS side. From my test, it will take some time but upload successfully in the end. Hence, we'd like to suggest you try some ways to narrow down the issue.
1.If the same issue will happen on any of the lists.
2.Check if change to another account will change.
3.Update to latest version.
4.Sign in your account on other devices and see if the same error will remain.
Appreciate your patience and understanding and thank you for your time and cooperation.
Sincerely,
Mia | Microsoft Moderator