You can upload a single image into a poll question for the audience to reference with the poll. This image will appear on the attendee's mobile device when the poll is unlocked for response. Note: this image will not appear on the projected screen (e.g., PowerPoint).

To add an image, look for the checkbox on the "Create a Poll" screen as shown below:

After clicking the checkbox, you'll have a box available to 'drag and drop' a file into. Or you can simply click inside the box and a standard 'Open File' dialog will appear for file selection. 

After choosing an image, complete the rest of your poll creation. If you need to change the image used, you can simply click in the box and choose a different image file, or you can click on 'Remove file' and then re-select a new image file.

When you open (unlock) that poll for audience response, the audience will see the image on their mobile device along with the poll question. Here's an example:

Notes: Large images are automatically resized upon uploading to help ensure a good experience for mobile users. Only one image can be uploaded. If you need the audience to choose among different images, considering using your favorite image editor to combine multiple images together along with a simple designation for each (e.g., Image A, Image B, Image C).