Hi 2worlds,
Welcome to Affinity Forums
Draw a shape, change to the Fill Tool if you are using Affinity Designer (or the Gradient Tool if you are using Affinity Photo) select Bitmap from the Type dropdown in the context toolbar on top and select the texture file you want to use to fill the shape from the Finder (or File Explorer if you are using Windows) window that will appear. Adjust the other options in the context toolbar if needed. You can then save this as a style (make sure the shape is still selected) clicking the small menu icon on the top right of the Styles panel and selecting Add Style from Selection.
