Hey Andreas, thanks for reaching out. That’s a good question, but I think I need more context for what you’re trying to do. What do you mean by ‘file’, ‘source’, and ‘target’? In the browser, the file would generally be a file you get access from using `<input type=”file”/>`. The user must interact with it and select the file from their computer. There’s no other way to access the file system through the browser. As from ‘source’ and ‘target’, I really don’t know what you mean. The source could be either the webpage or the user’s computer. And the ‘target’ would need to be some web server that is capable of receiving files. It’s not covered in this post, but the next post in the series covers that.

Feel free to reach out with more questions or details.