Here's my situation:

1. Edit the `App_Plugins\UmbracoForms\UmbracoForms.config` file and set the `AllowEditableFormSubmissions` field to `true`.
2. Create a form that has a file upload field.
3. Create one or more records using that form.
4. Make sure to upload one or more file attachments.
5. Navigate to `/path/to/page/using/form/?recordId={guid}`
6. The file upload control should show a list of currently-uploaded files for the record that you are editing.
7. Change another field on the form (not the upload field!) and re-save it.
8. When you view the record again, all uploaded files are now missing.

I would have expected the system to preserve these entries by default. Is this a known issue? Is there a workaround that allows us to preserve existing file uploads?

Thanks!