Course materials from the app are not downloading

hi there,
i had built custom app for ios which constitutes of courses, app is made for learning mangement system.
i was able to launch courses online via IOS app,but for offline downloading content (pdf,scorm,word,image etc) is not happening.
throwing out error as mentioned in the screenshot.

Xcode/ionic-cordova have been used to built the IOS app.

Is there anything can i do on plugins point of view for ionic-cordova.
how to proceed with this ?

That error is part of your application, you will have to know yourself what triggers it.

In general: Did you remote debug the problem on the device already? Follow these instructions here to debug the problem in Safari dev tools: Look at the console and network tabs for errors.

Hi Sujan,

Thanks for your reply, i will go through the above suggestion given by you.
using same source code app for android platform had been built and it works fine.
just wanted to convey this to you.

Thanks Again.

Yes, something is probably blocking these requests on iOS, maybe CORS related problem. You will have to find out via remote debugging.