Sending a cptx file and loading cptx file to adobe captivate prime account

Good day,

Sorry for the following beginner type questions:

First Question:

I am hiring an instructional designer. They will add some features to a mp4 3 minute video. They will then load it to my adobe captivate prime account. Once they load it, does that automatically remove it from their adobe captivate etool they used to add the features?

Second Question:

Can they email me the finished cptx file? If so, is there a special mechanism they must use to send it to me then I can load it to my adobe captivate prime account without giving them access to my adobe captivate prime account?

Thanks