The scoopa uploader can upload your files in background while using other apps. Longer running background uploads will currently be paused after about 30 seconds if not connected to a Wi-Fi network.
Please enable background refresh to ensure, that your uploads continue in the background while using other apps by navigating to “Settings > General > Background App Refresh > Background App Refresh. If you want to use the app only with WiFi, select “Wi-Fi”. If you want to use it with Mobile Data, please choose “Wi-Fi & Mobile Data”: