Asset files are included in full sandbox copies, so you can test your branding images
and reproduce the look and feel of your communities.
Available in: Enterprise, Performance, Unlimited, and
Include Asset Files in Full Sandbox Tests
Do you test Lightning apps or Community templates in a sandbox? Asset files are now supported in full sandboxes, so you can verify how your branding images are being deployed. You can see how your logo appears in your app, and proof your header and footer images in your Community template. Test changes to your branding imagery before you roll out new logos and other updates.