Amazfit Watch faces

Why is uploading so slow?

When the battery is low, background applications are broken. I've found that it works when the cell phone is on the charger.

Hello, does anyone have experience with iPhone SE 1.gen? It is not possible to upload the watch face via Amaz Face or Amaz Tool. It says that Mi Fit is not running in the background. Upload the watch face via the Mi Fit app store is very slow for about 4-5 minutes! It is normal?