Is there a recommended approach to store maps on external (SD) storage following the recent Android 11 update Storage updates in Android 11 | Android Developers
Documentation suggests "using a file explorer on your computer, browse to \Android\data\com.esri.fieldmaps\files\basemaps (if the folder doesn't exist, create it)", however the Android\data is no longer accessible following the update.
Yes it is blocked by default now.
If you plug into a PC you should see it.
On the device you can use a 3rd party app File Manager app that can see it. (some listed in link below)
On some devices like a Pixel you can see it in files app if you dig through the menus.
For more info do a search its a common post https://www.reddit.com/r/Android/comments/j3zgmm/managing_files_in_the_androiddata_folder_on/
Hope that helps