[iOS] Uploading from the app kills the battery

What am I doing wrong? When I leave my phone to upload (I normally use Mobile data rather than Wi-fi) the sequences the phone gets hot and then battery dies very quickly within a couple of hours.
The attached screenshot shows the battery status while recharging the phone. As you can see Mapillary was taking 100% battery and the graph shows the quick decline in power. I’m using iPhone X.

One more thing, I have to leave the phone screen on for the entire time for upload to work. If I lock the screen and then reopen to check the app, the upload seemed to have paused. It doesn’t seem to upload in the background. Is that intentional?

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