Why burned-in beats platform captions
Platform auto-captions are inconsistent across apps, often off by default, and unavailable when your video is reposted or used as an ad. Burned-in subtitles travel with the file, which matters because the same clip will end up on three platforms and in a WhatsApp forward.
They also let you control the reading pace and the line breaks, so a clinical term never splits across two lines — which is a small thing that noticeably affects comprehension.
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The medical proofreading step
Every automatic transcription mangles clinical vocabulary — drug names become ordinary words, procedure names become nonsense, and Arabic medical terms come out phonetically wrong. Someone has to read the caption file against the audio before export, and that someone should understand the terms.
Build it into the process as a named step rather than a good intention. One published video with a wrong medication name costs more credibility than ten good videos earn.
The style spec
Large enough to read on a phone at arm's length. Positioned in the lower third but above the platform's own interface, which covers the bottom on every app. Two lines maximum. High contrast with a subtle background so it stays readable over a clinic wall or a window.
For Arabic, right-to-left with correct shaping — subtitle tools that break Arabic letter joining are still common, and disconnected letters read as carelessness to every Arabic-speaking viewer.