File settings show a Choose file input in the Value column.

To upload: click the file input and pick the image. The upload starts as soon as you choose the file (no extra button) and the page reloads on the same tab. The file is stored under a fixed name based on the setting, so uploading again simply replaces the previous file. JPEG files are stored as `.jpg`.

To remove: when a file is set, its name is shown next to a small red X button. Click X to delete the stored value; the site then falls back to its default image (for example the standard logo placeholder).