Reduce Mobile Data and Increase Performance

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Use WiFi to download all assets

This procedure is used after a new install or game update to download images and other assets before they are needed. Otherwise assets will be downloaded as required while playing.

Downloading assets over WiFi can reduce your mobile data usage.

1. Touch your suitcase button
2. Touch the gears icon at the top left
3. Scroll down to Download All Assets and touch

Note: in the image below I have no assets to download. If I did I would see a red dot on the gears and the Download all assets text would be brighter.

Credit: @Acumen https://community.harrypotterwizardsunite.com/en/discussion/comment/11198#Comment_11198