Function upload_files_stream 

pub fn upload_files_stream<'a, IP>(
    arweave: &'a Arweave,
    paths_iter: IP,
    tags: Option<Vec<Tag<Base64>>>,
    log_dir: Option<PathBuf>,
    last_tx: Option<Base64>,
    price_terms: (u64, u64),
    buffer: usize,
) -> impl Stream<Item = Result<Status, Error>> + 'a
where
    IP: Iterator<Item = PathBuf> + Send + Sync + 'a,

Uploads files matching glob pattern, returning a stream of Status structs.