fix: manage big file uploads

[Eomm]

closes #383

increase coverage #202:

----------|---------|----------|---------|---------|-------------------
File      | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
----------|---------|----------|---------|---------|-------------------
All files |     100 |    96.85 |     100 |     100 |                   
 index.js |     100 |    96.85 |     100 |     100 | 163,247-254,551   
----------|---------|----------|---------|---------|-------------------

benefit #378:
from https://nodejs.org/api/stream.html#readablesymbolasynciterator

If the loop terminates with a break, return, or a throw, the stream will be destroyed