saving to an external hard drive
I got external hard drive to supplement my Apple Mac Mini's very small storage. My intention is to use the external drive for the files I work on daily (I'm a writer) sort of how I was using Dropbox before. But every time I save a file I have open from the external drive, it changes the name to a temp file (i.e. .~WRD3958) and does not save to the master file (if that makes sense). I got in and do "save as" to override the original file, which works sometimes until I hit "save" again and then I'm back in the temp file limbo.
Help! How do I make this stop? What do I need to do to make my external drive function more like my internal hard drive or Dropbox, i.e. save the original file without my having to force it?
Mac mini, macOS 15.3