You can upload content to the tmp directory.

Contents of /pub/

.. (parent directory)

tmp
  directory
06/28/18 03:43

rack
  directory
06/27/18 14:59

momslogo
  directory
11/11/17 17:16

garyImages
  directory
03/17/18 17:00

mileage
  directory
07/01/17 18:45

house
  directory
06/26/18 16:46

upload
  directory
09/24/15 23:25

sawtooths
  directory
09/08/17 15:35

timezones
  directory
06/08/17 22:57

flogNew
  directory
03/28/17 19:05

slaw
  directory
06/28/17 01:43

web tools
  directory
07/12/17 16:17

Working Class Hero
  directory
05/17/17 19:44

./haha.jpg
35kb   image/jpeg
03/24/17 22:08

./ryanstefani.pub
468b   text/plain
10/22/14 21:37

./insurance-mexico-dec page-1507314944.pdf
280kb   application/pdf
10/06/17 18:35

./lotto.html
7kb   text/html
05/06/17 15:30

./index.php
120b   text/x-php
06/30/17 14:28

./tor.zip
72.9mb   application/zip
02/10/18 21:20

./feature.jpg
68kb   image/jpeg
07/08/15 13:11

./throbber.html
132b   text/html
11/10/13 20:25

./feedly.opml
6kb   application/xml
09/14/14 16:14

./alpineManicure.jpg
238kb   image/jpeg
01/15/18 05:31

./chetinad.html
2kb   text/plain
02/27/18 01:18

./ not-a-bug.jpg
68kb   image/jpeg
07/08/15 13:11

./popsicles.jpg
50kb   image/jpeg
08/10/12 21:51



More stuff: oneDrive dropbox