> ## Documentation Index > Fetch the complete documentation index at: https://help.lobyco.com/llms.txt > Use this file to discover all available pages before exploring further. # Upload images for the app > Upload background images and home content icons for the app. This page helps you upload a background image or a home content icon for the app, and copy its web address (the **Copy image URL** button). Only admin users with access to app configuration can open this tab. ## Open App configuration 1. In the left panel of Lobyco Nexus, open **Global Settings**. It sits in the **Promotion Platform** group. 2. Select the **App configuration** tab. ![The App configuration tab of the Settings screen, with the line Upload background images and home content icons for use across the app, and that the files are stored under the background-images and home-content-icons folders in the assets service. Image type is set to Background image (9:16). Upload image, a required field, is an upload box reading Drop file here to upload or select file, with the rules under it: Allowed formats: .jpeg,.jpg, Max size: 1 MB, and Image must have a 9:16 aspect ratio. Enter image URL, with a link icon, is to the right of the box.](https://mintcdn.com/lobyco-4c9fb3ad/rG971_5ZfS49bcjM/images/administer-04-app-configuration-tab.png?fit=max\&auto=format\&n=rG971_5ZfS49bcjM\&q=85\&s=5a90ec531180dffa397a246897310c4d) *The App configuration tab* ## Choose the image type Open **Image type** and pick what you are uploading. | Image type | Where it shows in the app | Ratio | Format | Size | | - | - | - | - | - | | **Background image (9:16)** | Behind the Home screen | 9:16, for example 1080×1920 or 720×1280 | `.jpeg` or `.jpg` | 1 MB at most | | **Home content icon (1:1)** | On a shortcut on the Home screen, or on a row in one of the app's menus | Square, 1:1. Lobyco recommends 144×144 or 196×196. | `.png` with a transparent background | 1 MB at most | Switching the type empties the field below. The rules for the chosen type are printed under the upload box. ## Upload the image 1. Drop the file on the upload box, or select **select file** and choose it. 2. The image uploads as soon as you choose it. A preview appears in the box, and there is no **Save** button on this tab. Lobyco stores the uploaded image and gives it a web address of its own. The tab doesn't list your uploads. If you leave the tab or switch **Image type**, the box empties and you can't get the address back. So [copy the web address](#copy-the-web-address) first. If you lose it, upload the image again to get a new address. To pick a different image, select **Change file**. If the image breaks one of the rules in the table, the portal rejects it and shows an error under the box. This tab has no button to delete an image you have already uploaded. ## Crop the image Once an image is in the box, a **Crop image** button appears next to the preview. It opens a **Crop Image** window. 1. Move the image, and use the **Rotate** and **Zoom** sliders to frame it. The crop keeps the ratio of the chosen image type. **Reset** puts the image back as it was. 2. Select **Save**. To close the window without cropping, select **Cancel**. Saving uploads the cropped image as a new `.png` file, and the box then shows that file. ## Check an image that is already online If your image is already online, you can paste its web address to check that it has the right ratio. Lobyco doesn't store the image. 1. To the right of the upload box, select **Enter image URL**. The box is replaced by an **Image URL** field. 2. Paste the web address into **Image URL**. The hint under the field repeats the ratio and format for the chosen image type. 3. To go back to uploading a file, select **Upload image**. If the image doesn't have the right ratio, an error under the field says **Image has incorrect ratio**. An address that doesn't load gives the same error, so check the address too. The portal checks only the ratio, not the format or the size. Check the format and size against the [table](#choose-the-image-type) yourself. **Copy image URL** gives you back the web address you entered. ## Copy the web address A **Copy image URL** button appears below the field whenever it holds an address. That's after you upload an image, or once you enter a web address, even one with an error. So check that there's no error under the field first. If an error shows, fix the address or the image first. Select **Copy image URL**. The message **Image URL copied to clipboard** appears. ## Troubleshooting > **Why can't I see the App configuration tab?** > > The tab only shows for admin users with access to app configuration. Access to the other tabs on the **Global Settings** screen doesn't include it. Ask the person who manages access to Nexus in your organisation. > **Why is my image rejected?** > > Check the image against the table above. It may have the wrong ratio, be in a format the image type doesn't take, or be over 1 MB. Also check that **Image type** matches the image. A home content icon has to be a `.png`, and a background image has to be a `.jpeg` or `.jpg`. If you entered a web address, **Image has incorrect ratio** can also mean the address doesn't load. ## Related * [Exclude products from challenges](/business-documentation/self-service/exclude-products-from-challenges) — stop chosen products and categories counting towards challenges, on the **Product exclusions** tab of the same screen. * [Set the base bonus customers earn](/business-documentation/self-service/set-the-base-bonus-earn) — the bonus percentage customers earn on their purchases, on the **Base bonus earn %** tab of the same screen. This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.