Custom ini does't work in a packaged game(mobile)

I have defined a custom INI file using DevelopSettings and I am using GetDefault to get its value. On the PC platform, I can get the values set in the INI file, but on mobile platform, I only get the default values defined in C++. On the mobile platform, I have confirmed that the INI file exists using FPaths::FileExists, and I can also successfully get the correct INI string using FFileHelper::LoadFileToString.