This demo's PC-side scripts were run on macOS.  It uses
shared storage for both zips and content on the phone.
This example changes only pathnames in config files.

Note that zips and content need not both use shared storage
the way this demo does.  In practice, you might use app-private 
or app-specific for zipfiles to optimize sync speed, and shared 
storage for content to boost accessibility and longevity.

NONPORTABLE FILENAMES 
  Are fixed as a first step in the initial copy here, 
  because this is required for shared storage.  The 
  app-specific and app-private tests do not, because 
  those storage types allow Unix filenames.  macOS 
  silently munges nonportable filename characters to 
  work on the exFAT proxy, but the unzip to Android 
  shared storage would not retain files with such names. 

  The x* folder shows what happens to nonportable filenames
  in Android 11 shared storage if the fixer script isn't run.
  In it, nonportable filenames are skipped with error messages,
  because Android doesn't support name munges (see ziptools).

SYMLINKS 
  Are forged on the exFAT proxy by macOS, and yield stub 
  files when unzipped on the phone's shared storage because   
  they are not supported by Android there.  The stubs are 
  harmless unless backsynced to PCs.  See the basic-appspecific* 
  and basic-appprivate* folders' _readmes for more info.

For more info on filenames and symlinks, see the main doc's:
  _README.html#Nonportable Filenames
  _README.html#storagemetadata