To capture images, insert a column in your spreadsheet and include the word, "Image", in the column header. For example, if you want to capture three images, you might name your columns Image1, Image2, and Image3. When you regenerate column structure, AppSheet will automatically detect these columns and set their type to Image.

Alternatively, you can name the column anything you like and change the column type to Image on the Data > Column Structure tab.

For apps that want to exclusively work with small thumbnail images, we provide a Thumbnail type. AppSheet doesn't automatically detect the difference between a regular image and a thumbnail. To explicitly choose the Thumbnail type, change the Column Type to Thumbnail on the Data > Column Structure tab. To see an example of thumbnails, look at the Marketing Docs sample.

Capturing Images on Android Devices

On Android devices, the user is prompted with the choice to take a new photo or use the camera roll.

Capturing Images on iOS Devices

On iOS devices, the camera is launched by default. To enable browsing of photos from the camera roll, do the following:

  1. From the iOS home screen, click Settings to open the device Settings app.

  2. Scroll to and click AppSheet. It will be present if you have AppSheet installed on your iOS device.

  3. Under Camera, set Prompt for Camera Roll to On.

Capturing Images in a Web Browser

Your app can be run directly in a web browser; however, this impacts the behavior of image capture.

When an app is run in a web browser on a desktop or laptop, the camera isn't used for image input. Instead, the user is prompted to pick an image from the filesystem. When an app is run in a web browser on a mobile device, the camera is used for image input.

In either case, it's important to note the new or updated record with the image must be synced to the backend before the browser tab is closed. Otherwise, the captured image content will be lost. If you expect to run your app in a browser and the app captures images, do not enable delayed sync. If you do enable delayed sync, please advise your users to explicitly sync their changes before closing the browser. If the browser is used on a mobile device, be aware that simply switching away from the browser app to another app on the device may cause the browser automatically close.

Controlling Image Size

You can control the captured image size using the Editor > UX > Options > Image upload resolution. This sets the maximum image width to one of the following options:

  • Default: 600px

  • Low: 200px

  • Medium: 800px

  • High: 1600px

  • Full: use the original image size

If you have issues with device crashes or hangs while taking photos, please look at the article about troubleshooting application crashes and errors on mobile devices.

Annotating Images

To enable users to annotate images they've captured or uploaded, use the Drawing type.

How Image Capture Works

Here's how AppSheet processes the photos taken with the camera:

  • Any photo taken on a device with your app is saved in full resolution in the camera roll on the device. See how the camera function works in our Equipment Inspection sample app. Note that if you use the app on the desktop, the image capture function only allows you to open an image file. Using the image function on a mobile device will allow you to either upload an image from your device's gallery or to manually take a photo.

  • When the user presses the Sync button, the photo is uploaded at a reduced resolution to conserve network bandwidth. The image resolution used is controllable as described above.

Image Storage in the Cloud

By default, the captured image is saved in a subfolder in the same location as the spreadsheet.

  • The subfolder is called {TableName}_Images by default.

  • You can optionally specify a custom folder name by using the FolderLocation property of the column definition. The custom folder is also relative to the location of the source spreadsheet. This custom folder name can be a constant value or an expression that uses the column values of the table. This means images captured for certain rows can be stored in a different folder from images captured for other rows.

  • If your data source is a database (or some other data source that doesn't provide cloud storage), then there's no spreadsheet location to use. Instead, the platform uses the default app folder location (usually /appsheet/data/{appName}), or as configured in Info > Properties > App Properties.

  • It is also possible to store your images in a Cloud Object Store.

Within the folder, each image is saved with a unique file name.

  • Each image file name is prefixed by the key of the row being updated, the column name, and a short representation of a timestamp. The structure of the filenames is not changeable. However, you can use a computed-key if you would like to have more meaningful names for these files.

  • The row in the spreadsheet is updated to contain the name of the image file just created. The image file name includes the row key as well as the column name so it can easily be correlated to the corresponding row.

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