You can delete files from a dataset. To delete a file whose name contains a special character such as a backslash (\), you must first rename them. You can use a tilde (~) or colon (:) anywhere in a filename except at the beginning. If the file that you want to delete has a tilde or colon at the beginning of its name, rename it.
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Go to a project that uses a dataset.
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In the navigation pane, click Data.
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Select the checkboxes for the files to delete.
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Click Delete Selected Items or click Delete all items.