Separate starting a sync from completing it
The official Android and iPhone/iPad guides describe an offline sync button on the selected video. They tell viewers to disconnect only once the video has completed and to find synced copies through Library, then Offline. That sequence distinguishes the download request from a usable local item.
For example, someone preparing several episodes while packing may tap sync and immediately put the phone away. If the device sleeps, the preparation can stop. Check the actual Offline list rather than using the number of taps as your readiness checklist. A saved watchlist item is also a different state from a completed sync.
Make a bounded awake-screen preparation session
The publisher explicitly connects the open-app, screen-on requirement with avoiding operating-system interruption. For larger files it suggests considering battery-saving settings so the device does not sleep before completion. Use your device’s own instructions and restore any temporarily changed setting afterward.
Choose a small priority queue that you can supervise on a reliable connection. Keep the device in a suitable place and allow enough time for the work to finish. This is more useful than estimating that every episode should complete in the same number of minutes: the help says connection and video length make a standard estimate impractical.
Choose quality with storage in mind
Both guides identify HD Downloads in the profile’s download settings and explain that an available HD file uses more space than SD. Decide whether storage or picture quality matters most for the intended screen before preparing a large set of copies.
After syncing, inspect Library and Offline for the actual videos you need. If the process still stops, record whether the screen slept, the app moved to the background and the connection changed. Those details test the documented conditions without claiming every failure has the same cause. This guide uses official help and includes no download-speed measurement, paid-account sign-in or offline playback test.
Questions about this guide
Can I put the phone to sleep while downloading?
The publisher says to keep the app open and screen on throughout.
Where are synced videos found?
The documented route is Library, then Offline.