Telemetry File Previews

Browse Your Flight Files Like Photos

AltosUI registers as the handler for .telem files on your device. That means your telemetry recordings show up in the Files app with custom thumbnails and rich previews — you can browse your flight library without even opening AltosUI.

What You See

Custom Thumbnails — Every .telem file displays with a distinctive Altus Metrum icon in the Files app, so you can spot your telemetry files instantly among other documents. No more guessing which files are flight data.

Quick Look Previews — Tap a .telem file and you get a formatted summary of that flight without launching the app:

• Date flown
• Rocket serial number
• Callsign
• Device type — TeleMega, TeleMetrum, TeleMini, or TeleGPS
• Max altitude
• Max speed

Every .telem file is previewable — even files the app has never seen before (shared via iCloud Drive, AirDrop, or email). The preview reads the flight data directly from the file.

From Preview to Full Report

From the preview, tap Share → Open with AltosUI to generate the full Flight Report — altitude chart, phase analysis, recommendations, PDF export — without importing the file or changing your tracker list. See the Flight Report page for details.

iCloud Drive Workflow

Drop .telem files into iCloud Drive from your Mac. On your phone, browse to them in the Files app. Tap to preview, then open in AltosUI for the full report. The file stays in iCloud Drive — nothing is copied or imported.

When It Works Best

After a day of flying, when you want to review which flights were recorded. The previews let you quickly scan through your flight library and find the one you're looking for — by date, by rocket, or by peak altitude — without loading each file individually.

Also useful when sharing flights with fellow flyers — the recipient sees the flight summary right in their share sheet.