box_ul
(who's use is recommended as
an alternative to these functions).
box_upload_new(dir_id, file, pb = FALSE)
box_update_file(file_id, file, dir_id, pb = FALSE)
httr
object returned by the api call
box_upload_new
make the API call to upload a new file.
box_update_file
makes the API call to update an existing file.