You are able to import a site logo into your mobile app gallery's header using the CMS tools in your admin menu. Proceed with the following steps:
  1. Go to your gallery's admin dashboard.
  2. Click Settings.
  3. Click the Interface tab.
  4. Click the App Store Assets link.
  5. Click the New Asset button at the top right of the page.
  6. Choose the file image you want to upload (may choose image file from desktop or paste in an image URL).
  7. Under the File Type drop-down, select Mobile Web Logo (235x74) *
  8. Click Update and wait for the page to refresh.

* The system will automatically resize images to match the current dimensions, although there may be warping if the dimensions do not fit within 235x74.

To Delete an existing mobile logo, click on the png-1.png symbol and confirm to remove.
To Edit an existing mobile logo, click on the png.png symbol and re-upload the assets.

Example:

example.jpg