Compare the same page and image on both devices, and record the time of each test. Say whether desktop fails in one browser or several, whether thumbnails load while full images do not, and whether the two devices use the same network. A mobile success alone does not prove a desktop-app bug; network path, cache, and account state may differ.
Avoid posting private image URLs or screenshots with personal data. Check the service’s official status updates, then give support the safe error text and a representative public page if available. If you retry, note whether the image eventually appears or remains broken. This keeps the report reproducible without oversharing.
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