At this point, the question becomes: what exactly should you upload?
Publitio supports .VTT file upload and is easily allowing you to connect your .VTT captions with your video files.
If you have a .SRT caption, you can use a subtitle converter and convert .SRT caption to .VTT caption free. https://www.happyscribe.com/subtitle-tools/convert-srt-to-vtt
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