I want to remove my files from Dropbox

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@Robert Paterson wrote:
the file does not work when you export it to non drop box source , it does no matter what the file is it won’t work

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Is the file marked as Available Offline before you try to move it out of the Dropbox folder? If it's an Online-only file, you might be copying the place-holder file and not the actual file. Right-click a file (or many files, or a folder) and select Make available offline. Give it time to sync and wait until you see a green check mark on the file(s) before you try to move it out of the local Dropbox folder.

The message about copying or moving without the file's properties can usually be ignore. It just means that there's some extended metadata stored with the file that can't be stored on whatever drive you're copying it to and will be lost. This has nothing to do with the actual data in the file. It only refers to extended metadata.