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Mobile File, Preview, And PDF Issues

Desktop Works, Mobile Fails

Likely causes:

blob URL handoff does not work well in Salesforce mobile,
popup/new tab is blocked,
browser REST upload lacks a usable mobile session,
final artifact is an HTML wrapper instead of a real PDF,
file preview URL is not durable or accessible from mobile context.

Fix patterns:

use durable HTTPS URLs for final mobile PDF handoff;
prefer platform-supported file navigation or preview where it works;
distinguish upload success from preview/download success;
verify latest ContentVersion and parent ContentDocumentLink access;
keep client-side rendering if fidelity requires it;
avoid one-shot base64 upload to Apex for large documents;
avoid Apex heap-heavy file reconstruction;
validate CSP, CORS, named credentials, and external provider config together.

Use Mobile Camera And File Handoff and Photo Capture, Annotation, Viewer, And Generated File Patterns for full lifecycle checks.

Camera Active But Blank Preview

Cause:

camera acquisition succeeded, but visible component shell or preview surface did not paint.

Debug order:

prove parent state,
prove child mount,
prove shell visibility,
prove permission and stream,
prove preview first frame,
prove close cleanup.

Page Frozen After Close

Cause:

scroll/touch blockers or media tracks outlive the visible overlay.

Fix:

close path should stop tracks, clear media source, release blockers, and only then dispatch close to parent.