Choose the accessible programme version
STV’s help points to Audio Described and Visually Signed categories under Browse or Categories. Selecting a listed programme there plays the relevant version. That is different from enlarging text over the ordinary programme. If the viewer needs signing or description, begin with the version supplied for that purpose rather than treating a subtitle-formatting menu as the solution.
Confirm whether a subtitle track is offered
The help identifies an S or speech-bubble symbol for available subtitles. On iPhone or iPad, STV specifically advises choosing English directly if the Auto option does not show text. Compare the same programme after that selection. A listed English option behaving differently from Auto is a more precise observation than a claim that all subtitles are unavailable.
Adjust style at the documented device layer
STV’s iOS instructions place caption size and style under the device’s Accessibility settings. They also describe Video Override, which can allow a programme’s supplied styling to take precedence. If one episode ignores a preferred size while another follows it, inspect that setting rather than assuming every programme shares the same embedded style.
Report the layer that failed
Identify whether the accessible edition cannot be found, a listed track does not render or the text appears with the wrong styling. Include the programme and device, and describe the actual control used. A clear report separates missing source material from selection and presentation issues. None of these controls establishes that every programme supplies signing, description or captions.
Questions, answered
Can larger subtitle text create an audio-described version?
No. Select the relevant programme version where STV supplies one.
What does STV suggest if iOS Auto subtitles show no text?
Choose the listed English track directly, then return to the programme.