mock-up app with custom background image

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Is there a mock-up app that allows you to upload a custom background for a t-shirt to be printed on with our custom art floated over the background. Most of the apps seem to provide background images and allow you to float your artwork over them. I am looking for an app that allows us to edit the background of the mock-up. We need the same functionality of the other mock-up apps in terms of integration with Shopify and our t-shirt vendor.