'External memory access denied on Android 11

several years ago I made an app that worked great with all updates up to Android 11. Today I uninstalled the app and tried to reload it, but I can't find any way to make it work. Access to files in external memory is inhibited, despite having included the MANAGE_EXTERNAL_STORAGE statement in the manifest. I tried targeting Android 9, 10 and 11 but it wasn't helpful. My smartphone is a Redmi note 9 pro, with Android 11 RKQ1.200826.002, and the Visual Studio 19 development platform. C # language. Any ideas to solve? Thank you all



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