This app is a viewer for recipes in Nextcloud App. You need another app (e.g. the Nextcloud Android client) to sync the recipes to your Android device.

First steps

After installation you must go into the settings view and select the recipe directory with the recipes inside.
When using the Nextcloud Android client, you find it on your storage under Android/media/com.nextcloud.client/nextcloud//.
You also can choose the theme in the settings.
After that, the start view has a list of recipes and you select a recipe to view the details.

Troubleshooting:
Make sure, the recipes are synced on the sd card, so the app can read the files.