The file ID of the resized Google spreadsheet as an invisible result.
Arguments
file
Path to a file relative to project folder root. Can contain only
letters, digits, '-', '_', '.', spaces and '/' symbols.
root
Google Drive ID or URL of the project root. This serves as the
reference point for all relative paths. When left as NULL, the root is
automatically derived from the cloudfs.drive field of the project's
DESCRIPTION file.