android - Export data (offline): save and share a file -


i offer convenient way backup data cordova app users. appealing me app backup data json file , offer user save/share same way other file.

i've got far saving data real file , invoking share dialog, file fails share/save. it's because external apps don't have permissions access file created app (gmail says: 'permission denied attachement') , don't know how allow external apps access file created app. ideas?

my code:

ex = json.stringify(ex);  window.resolvelocalfilesystemurl('cdvfile://localhost/temporary/', function(dir) {     console.log('directory resolved.');      dir.getfile('makeshift.json', {create: true, exclusive: false}, function(file)     {         console.log('date file created.');          file.createwriter(function (filewriter)         {             filewriter.onwriteend = function()             {                 console.log('data saved.');                  var time = date.now();                  console.log(file); // typeof fileentry                  window.plugins.socialsharing.sharewithoptions({                     message: 'my makeshift backup '+time,                     subject: 'makeshift backup '+time.yyyymmdd(),                     files: [file.nativeurl],                     choosertitle: 'choose how save data'                 },                 function(result)                 {                     file.remove(function (file)                     {                         console.log('data file removed.');                     });                 });             };              filewriter.onerror = function(e)             {                 console.log('there error writing data file.', e);             };              filewriter.write(new blob([ex], { type: 'application/json' }));         });     },     function(err)     {         console.log('there error creating data file.', err);     }); });


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