How to update a project on digital ocean (need to replace one file in the droplet)?

Question

DigitalOcean

There is a small question for those who worked with digital ocean, I will be grateful for the answer. a little more experience and didn’t work much with cloud hosting, but now you need to add Google analytics to the project (you need to insert a few lines of code into the html page). I connected to the droplet via FileZilla, I have html with the necessary piece of code on my local machine, how can I upload it to the hosting now? Just upload a file there via FileZilla and everything will work? (I'm afraid to do something wrong so as not to drop the application))