A damage photograph. An installation sign-off. An asset label from a previous visit. Case evidence images are essential, but they frequently become the slowest part of the field workflow over a weak connection. A 4 MB original downloaded over a patchy 3G link stalls the screen and makes the timeline unreadable. The engineer cannot confirm which image to reference without waiting - and while they wait, the work stops.
The problem is not that images are too large. The problem is that the system treats every image as a demand for full-resolution delivery before the engineer can act. That is an artifact of how many case tools handle attachments: they load everything at maximum quality by default, regardless of what the engineer actually needs.
Thumbnails That Protect the Workflow
Latch serves protected image thumbnails on the case timeline when the connection is slow or when the device requests a bandwidth-conscious view. The thumbnail is not the original. It is a reduced-size version, still authenticated, that loads quickly enough to let the engineer scroll, identify the right evidence, and decide what requires closer inspection.
The security model does not change. A thumbnail is served only if the engineer's role permits viewing the attachment. No public URLs. No accidental exposure of evidence outside the authenticated session.
When the Original Is Required
Thumbnails are enough for most in-field decisions: confirming that a photo exists, recognising the asset by its label, or verifying which damage report is attached. When the engineer needs to examine fine detail - reading a serial number in an image, inspecting corrosion, or sharing a full-resolution file with a remote specialist - Latch allows a deliberate request for the original. The full image loads on demand. The system does not force the download before the engineer can interact with the timeline.
This keeps the default experience fast and leaves the bandwidth-intensive step optional. An engineer on a very weak link may choose to wait until they are back in range before pulling originals. The decision stays with the operator.
What This Release Does Not Change
This update does not add offline image queues. An engineer cannot capture new photos while disconnected and have them upload when the signal returns. That capability sits outside the current scope. The release focuses solely on making existing case evidence practical to view and reference during constrained connectivity.
It also does not compress images on the client side. Thumbnails are generated server-side, and the full-resolution originals remain unaltered. The engineer always has a path back to the unmodified file when evidentiary integrity matters - for example, during an insurance claim or an audit that demands the exact original capture.
Why Authenticated Access Matters
Images in a field case often contain sensitive information: customer premises, equipment serial numbers, damage assessments that carry financial consequences. Making them available through thumbnails should not weaken that boundary. Latch enforces the same authentication and role-based access controls for thumbnails that it does for originals. The delivery format changes. The permission check does not.
This is a small architectural detail that has operational weight. A field engineer in a shared workspace should never worry that a thumbnail on their screen can be shared by pasting a URL. The system does not expose unauthenticated paths.
Operating Principle
Case evidence is only useful if it loads. On a job site with poor connectivity, speed and access control must travel together. Protected thumbnails give engineers enough context to keep working. On-demand originals give them the full detail when the circumstance demands it. Neither compromises the evidence record. That is the tradeoff this update makes explicit.
Continue reading: the field-service release overview, connection-resilient field case handling, asset context for field service cases.