Step 1 is to upload the file to Bubble. There are numerous ways to do this, and plugins for Dropbox, Google Drive etc.
The method used here is an illustration of how to use the Bubble multifile uploader dropzone. Explained here
https://www.youtube.com/watch?v=5_sJbiM25xgStep 2 is to use this plugin to tell Vimeo to pull the video from Bubble and upload it.
- get a token from Vimeo - explained here
https://youtu.be/Bod1is_Ezk8 Watch this video and create the token carefully per these instructions.
- add the token with the word "bearer" in front of it into the plugin setup. - explained here
https://youtu.be/BPHIJ52LieQ- add a workflow action to "Upload from a URL" - passing it the Bubble URL of the video you uploaded. - explained here
https://youtu.be/mo2jEhgb06o That's it.
Contact me in the forum @lindsay_knowcode for any help. Purchase of the plugin includes reasonable help from me to get you up and running.