You may notice that the app pauses file upload when you return to the Home screen or switch to a different app.
That's because the app can only be kept in the background for a small-time (around 1 minute only).
Note: At the moment, you have to keep the app open if you need to upload multiple items or large files. Changing the Auto-Lock timer value to Never in iOS Settings > Display & Brightness should prevent the device from auto-locking, without the need to touch the screen. Once you complete your file upload, do not forget to return to your preferred setting.
This pauses the upload, thank telegram for that.Today when I was uploading a big file in android(the official telegram app),I pressed the home button and re-entered in telegram,it started uploading from 0Bytes once again.
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