1. Dropbox Shortcuts
Platform: Web Application/English
Shortcuts are enabled / disabled in Account Settings -> (un)check
'enable' file browser keyboard shortcuts
a
Check all/no files
n
Uncheck all files
c
Copy checked files
m
Move checked files
u
Up a directory
p
Check deleted files
i
Invert checked files
/
Search
d
Show/hide deleted files
esc
Hide Popup
?
Show keyboard shortcuts
k/j
Highlight previous / highlight next file
space
Check highlighted file
o
View highlighted file
http://www.shortcutworld.com/en/web/Dropbox.pdf