Put it into practice
- State what the mockup is meant to communicate.
- Share a clearly named draft.
- Ask about hierarchy, accuracy and destination fit separately.
What this looks like
A reviewer checks whether the hero demonstrates the main feature, not whether the app needs unrelated functionality.
A detail to keep clear
A flattened image is a visual proposal, not a functional prototype.
Using MockupX
These workflows describe ways to use the editor, not separate automated services. Keep original images and delivery notes outside the editor when a repeatable handoff matters. For paid work, check rights to screenshots, brand assets and stock imagery before publishing.
Check the result
Keep the original screenshot, then review the exported file at the size where people will see it. Check the message, the visible interface and the final crop separately. For a handoff, record the destination and the approved file so another person can distinguish the final version from a draft.
References and further reading
Use the official references for format behavior and current destination requirements. The composition advice above is a practical design approach, not a promise of platform approval.
MDN image formats ↗