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If your goal is to update your form to a new version that you had previously downloaded to disk or to revert to an older version previously downloaded to disk, do not first delete the form since, as stated, this removes all associated saved/submitted/pending form instances. Instead leave the original as it is and upload the version from disk by clicking the upload icon. A dialog will display that lets you browse to the form on disk and give you the option of replacing the current with this new version. Checking the option to ignore XML schemas in the form being uploaded if those schemas already exist in the application, results in the existing schemas being used.
