Rumble allows you to upload subtitle files, but you have to create them first. Since Rumble doesn't generate them for you automatically, follow these steps: How to add subtitles in Rumble - HappyScribe
Getting English subtitles on Rumble can be a bit tricky because the platform doesn’t currently offer a built-in "auto-caption" button for all videos like YouTube does. Whether you’re a viewer trying to follow along or a creator looking to make your content accessible, here is how to get the job done. Rumble subtitles English
If the creator didn't upload a subtitle file, you won't see a "CC" button on the Rumble player. However, you can use your browser or device to generate them for you: Rumble allows you to upload subtitle files, but