'drag and drop' is actually 'drag and copy' - so how to fix this

mechanic1357 wrote:

It's into a window on Firefox, which accepts the file but leaves the original file in place in Finder. It would be nice to have a choice offered then to delete the original file or leave it unchanged?

Refer to posting by @VikingOSX in link

Is there a move to option in finder for f… - Apple Community

Specifically

" Select a file and copy it to the clipboard with cmd+C. At your move destination folder, press the option key and cmd+V and the file is moved.

You can visualize this by selecting the file in the Finder, and on the Finder's secondary menu, you can select Copy, and at the move destination, again reveal the Finder secondary menu and you will see Paste Item. When you press the option key, that menu item changes to Move item here. "

Is the new location on a different volume? If so that's normal.

mechanic1357 wrote:

Ah, thanks for the pointer!

You are welcome

Though, we are only the disseminator of already available information

It's into a window on Firefox,

That's not a folder or location. It's an instruction to upload.