If you’re publishing in several languages, export each language separately first — see Steps below for how to name the resulting files.
Steps
Pick a resolution for the platform. YouTube and Bilibili both compress uploads server-side, so exporting at 1080p is usually enough for talking-head or screen-capture content; export at 4K/5K (Pro) only if you plan to let viewers zoom in on fine on-screen detail, like small UI text in a coding tutorial. Self-hosted course platforms with limited storage or bandwidth budgets often prefer 1080p across the board.
Decide whether to burn in subtitles or upload the SRT separately.
YouTube — upload the SRT as a separate caption track rather than burning it in. YouTube lets viewers toggle captions per language and indexes the text for search, and you keep a clean video track if you re-caption later.
Bilibili — Bilibili’s native caption support varies by account type, so many creators burn subtitles into the video for reliability. If you burn in captions, export with subtitles enabled in AutoCast’s caption settings before rendering; see Generating, editing, and exporting captions.
Self-hosted course platforms — check whether your video player (e.g. an HTML5 player with WebVTT/SRT support) can load an external SRT track. If it can, upload the SRT separately for smaller file sizes and easier updates; if it can’t, burn in the subtitles before export.
Name your files clearly for multi-language uploads. AutoCast already appends the language code to each exported file, so keep that suffix intact — for example onboarding-demo-en.mp4 / onboarding-demo-en.srt and onboarding-demo-es.mp4 / onboarding-demo-es.srt. Matching base names make it obvious which SRT belongs with which MP4 when you’re uploading several languages to the same platform.
Upload the MP4, then attach the matching SRT in your platform’s caption or subtitle upload step, selecting the correct language for each.
What you should see
A set of correctly named MP4/SRT pairs per language, uploaded with captions either burned in or attached as selectable tracks depending on the platform you chose.
Common issues
Captions don’t show up as a selectable track on YouTube — confirm you uploaded the SRT file itself as a caption track (Subtitles settings on the video), not just the MP4.
Burned-in subtitles look cropped on Bilibili — check your recording’s aspect ratio in AutoCast before export; burned-in captions are placed for the full frame, so an unusually tall or short crop can push them off-screen.
Wrong SRT paired with the wrong MP4 — re-check the language code suffix on both files before uploading; this is easiest to catch before you start.