I want to write a file from notebook to blob storage. we have configured unity catalog. When it writes it creates the folder name as the file name that I have provided and inside that it writes multiple files as show below. Can someone suggest me on how I can write it as single file - 

_committed_3484505682152580967
_started_3484505682152580967
_SUCCESS
part-00000-tid-34845056821525809
67-77c7321e-c7f1-4194-b5f2-e5194aa2eb52-740-1-c000.csv