No such file or directory

my ide does the same thing .
where do get the information as to where the ide keeps *.h files .
because it does not look in ./ ; ( present directory -- exactly same folder )
i have tried the dropdown include file ..

not getting the *.h files included kinda makes the IDE useless , when you consider that inventing is plain and simple
stapling pages to on to each other till it is a book.
what folder do i putthem in ?

Arduino: 1.8.5 (Linux), Board: "Arduino/Genuino Uno"

/home/pat/AArduodo/TouchScreenMenu_v1.2/TouchScreenMenu/examples/TouchScreenMenuTest/TouchScreenMenuTest.ino:25:29: fatal error: TouchScreenMenu.h: No such file or directory
#include <TouchScreenMenu.h>
^
compilation terminated.
exit status 1
Error compiling for board Arduino/Genuino Uno.

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

file is in same folder as sketch -- it is also included ?