Rumo media delivery validation

Option 1 implemented: inline compression progress, a real time estimate, Meta-safe output, and WhatsApp-style durable offline delivery for image and video attachments only.

✓ iOS simulator passed ✓ Android emulator passed ✓ 64 focused tests passed ✓ GitHub CI passed PR #23

5 MBMeta image ceiling

16 MBMeta video ceiling

4.5 MBRumo image target

15.0 MBRumo video target

Simulator evidence

iOS · iPhone 17 Pro Max

30.7 MB source → 9.5 MB ready file

iOS compression progress at 42 percent — Compressing · 42% · about 8 seconds

iOS video ready and saved locally — Ready · durable offline outbox

Android · API 36 emulator

30.7 MB source → 9.1 MB ready file

Android compression progress at 42 percent — Compressing · Send disabled

Android video ready and saved locally — Ready · upload on reconnect

What the user experiences

The picker closes immediately and an inline media card appears.
The card shows measured progress and an estimated time remaining.
The user can keep typing, but Send stays disabled until the file is safe.
When complete, the card shows a Ready check and the final file size.

Prepared image/video bytes are copied from temporary picker storage to the app's durable documents outbox.
The send payload is persisted across restart and cache eviction.
Connectivity restoration triggers automatic retry using the same echo ID, preventing duplicate messages.
The staged file is deleted only after the server confirms upload.

Failure analysis

Oversized JPEG/PNG and MP4/3GP: previously reached the API above Meta's hard ceiling. Rumo now compresses to a safety target below the ceiling and rejects any output that still exceeds it.
HEIC, WebP, GIF, MOV and incompatible video codecs: unsafe formats are normalized to JPEG or H.264/AAC MP4 before send, preventing rendering and formatting failures.
Temporary picker URIs: OS cache cleanup could invalidate an offline message. Only images/videos are copied into durable app storage before they become sendable.
Android native transcoding: simulator validation caught the retired Android artifact and disabled native registration. The PR enables autolinking and moves Android to the maintained, SDK 35/16 KB-compatible drop-in artifact.
Other attachments: documents, audio and every non-image/video type retain their existing behavior.