Android 11 changes the security model for external storage, by enforcing scoped storage. The Android client app still targets Android 10, and for the time being it can opt out of scoped storage by setting a flag in the manifest. Version 6.3.7 is the first release that does this.
But this is only a temporary fix. Eventually I will be forced target Android 11, at which point the app will no longer be able to access the existing Vanguard directory.
- In the long run, external storage is dead.
- The logical replacement is Google Drive.
Google should be honest with developers and tell us this upfront, instead of obfuscating everything, and leaving us to work it all out for ourselves.
If you use the Chrome browser, then you already have a Google Play account, and should seriously think about using Google Drive anyway. In a nutshell, the Vanguard directory in external storage will be replaced by a folder in Google Drive.