You cannot do either. Resources has no rename and no move, and there is no drag and drop between folders. The only actions are Upload file and New folder, plus History, Trash and Restore on each row.
So the habit that saves you the trouble is: create the folder first, open it, then upload. A file always lands in the folder you are looking at, and the breadcrumb at the top of the page tells you which one that is.
Get the name right before you upload
The name shown in Resources is the name of the file on your computer at the moment you uploaded it. It cannot be changed afterwards. Rename it locally, then upload.
If a badly named file is already there, the fix is to upload a correctly named copy and send the old one to the trash. Both then exist as separate files, each with its own history.
Moving a file to another folder
There is no move, so this is a copy and a trash:
- Open the folder you want the file in.
- Upload the file again from your computer. It becomes a new file there, starting at version 1.
- Go back and trash the original.
Two things follow from that, and they are the reason it is worth getting the folder right the first time. The copy does not carry the original's version history, so earlier versions stay with the file you trashed. And trashing does not give the space back, so the project's storage figure counts both copies. See Resources storage limits and how to free space.
Uploading the same name into the same folder is not a duplicate
This is the one case that behaves differently, and it is useful. Upload a file with a name that already exists in the folder you are in and it becomes the next version of that file rather than a second copy. History on that row shows every version, with sizes, dates and who uploaded each one, and each version stays downloadable. File versions in Resources covers it.
That only works when the folder and the name both match. In a different folder, the same name makes a separate file.
Trash is reversible
Trashing hides a file rather than destroying it, because older versions of your project may still refer to it. Restore brings it back, and it brings back any folders above it that were trashed too, so a restored file is never left somewhere you cannot reach.