As I mentioned eariler, this is a change I’m very pleased was made. However, I think it makes the topic of this thread - the feature request - even more relevant. More conscious effort has to be made to upload files now (a good thing), but it’s more awkward than it need be (while before, it was too easy).
As the OP mentions, it’s necessary to browse through folders, locate and right-click files etc. If the files are already open, it seems like unnecessary work to find them again in order to upload them.
This struck me just now as I was using the recently improved search facility. I was editing a series of files and then wanted to upload them. To do this, I had to close the search panel and switch to file manager, and then find the files one at time to upload them, even though they were all open on my screen.
(Another thought - an option to upload all open files, by right-clicking on a tab, would be a great time-saver.)