Display user warning from Unified File Viewer for over-sized files on mobile devices

Current Behavior

In the transition from InField 1.0 to InField 2.0, PDF rendering on mobile devices shifted from utilizing the device's native viewer to rendering in-app using the Unified File Viewer. Native viewers are written in native code (C/C++) and render directly to the GPU meaning that they can stream pages and down-sample large images on the fly without memory constraints. But this change, while necessary to support advanced interactive features, subjects the viewer to strict memory limits enforced by mobile browsers (e.g., iOS Safari, for example, caps total canvas pixels at ~16.7 million.). Consequently, when a user attempts to open a highly complex or large document that exceeds this safe mobile rendering threshold, the browser fails without providing any notification or context to the user.

Proposed Solution

Implement a clear warning prompt within the Unified File Viewer when a document’s size exceeds the safe mobile rendering limit. A notification such as, "Document size too large for mobile, please use desktop," should be displayed to the user instead of the application failing silently.

Value

This enhancement will significantly improve the user experience by setting appropriate expectations and providing actionable guidance when mobile browser limitations prevent document viewing.