On Amara, you can sync your captions directly to your Youtube or Vimeo account. Here’s how: go to your account setting ->link your Youtube and Vimeo account-> start captioning your video-> Publish.
After publishing your captions, Amara will identify whether this video belongs to your Youtube or Vimeo account. If the video belongs to you, Amara will automatically sync your captions to your Youtube or Vimeo video. Note that other people’s captions and translations will also automatically sync to your Youtube/Vimeo account after publishing without an extra step for you to review them.
It is easy to remove any contributions from other people from your Youtube/Vimeo interface. However, if you edit the captions through Youtube/Vimeo interface, the result might be overwritten by Amara, so after you connect your video on Amara, we recommend editing your captions through Amara interface.
If this video does not belong to you, and the owner of the video hasn’t synced the video to Amara, the caption won’t sync to the account.
If you prefer uploading your captions to Youtube/Vimeo manually, you can also download your captions in Youtube/Vimeo-compatible formats and upload to your video through their interfaces.
For Vimeo, you can use SRT, WebVTT, DFXP/TTML, SCC, and SAMI files, but they recommend using WebVTT whenever possible.  For Youtube, you can upload SRT or SBV files.