data.localSave on ipad

[xenon-nonex]

Dear all,

I am have some trouble using data.localSave. When I run my experiment with the browser on PC, data.localSave works and a dialog pops up everytime for saving data file locally. However, I tried to run the experiment with ipad and found that localSave did not work. No dialogs or information showed up, and I cannot find the data file on my iPad. Please find the related lines below.

jsPsych.init({
timeline: [welcome, practice, node], // timeline of the block
on_close: function() {
var data = jsPsych.data.get()
async function save_before_close(data) {
data.localSave('json', filename + '.json');
await (300)
}
save_before_close(data);
},

Does anyone have an idea about this issue? Thank you.