Yes, my config file is there.
I have my datadirectory configured at /var/owncloud/data. I didn't think about this when making the above post. Here's the tail of the owncloud.log file.
{"reqId":"ITZkKPSTIo\/\/UkUmm\/ts","remoteAddr":"98.230.108.71","app":"PHP","message":"stream_copy_to_stream() expects parameter 3 to be integer, string given at \/usr\/share\/nginx\/owncloud_9_0_1\/3rdparty\/sabre\/http\/lib\/Sapi.php#78","level":3,"time":"2016-07-22T13:18:06+00:00","method":"GET","url":"\/remote.php\/webdav\/emulation\/Sega%20Saturn\/roms\/Enemy%20Zero%20(1996)(Sega)(JP).zip","user":"maxolasersquad"}
{"reqId":"mcW2ewPJT2RwnuOT1gZ4","remoteAddr":"98.230.108.71","app":"PHP","message":"stream_copy_to_stream() expects parameter 3 to be integer, string given at \/usr\/share\/nginx\/owncloud_9_0_1\/3rdparty\/sabre\/http\/lib\/Sapi.php#78","level":3,"time":"2016-07-22T13:20:41+00:00","method":"GET","url":"\/remote.php\/webdav\/emulation\/Sega%20Saturn\/roms\/Enemy%20Zero%20(1996)(Sega)(JP).zip","user":"maxolasersquad"}
{"reqId":"4NFRLHaYm5iRzbDFXqRQ","remoteAddr":"98.230.108.71","app":"PHP","message":"stream_copy_to_stream() expects parameter 3 to be integer, string given at \/usr\/share\/nginx\/owncloud_9_0_1\/3rdparty\/sabre\/http\/lib\/Sapi.php#78","level":3,"time":"2016-07-22T13:23:07+00:00","method":"GET","url":"\/remote.php\/webdav\/emulation\/Sega%20Saturn\/roms\/Enemy%20Zero%20(1996)(Sega)(JP).zip","user":"maxolasersquad"}
{"reqId":"HhP552GGU1xPUjNPk840","remoteAddr":"98.230.108.71","app":"PHP","message":"stream_copy_to_stream() expects parameter 3 to be integer, string given at \/usr\/share\/nginx\/owncloud_9_0_1\/3rdparty\/sabre\/http\/lib\/Sapi.php#78","level":3,"time":"2016-07-22T15:25:06+00:00","method":"GET","url":"\/remote.php\/webdav\/emulation\/Sega%20Saturn\/roms\/Enemy%20Zero%20(1996)(Sega)(JP).zip","user":"maxolasersquad"}
{"reqId":"SCwGL3xo3YNZJTMQYlUD","remoteAddr":"98.230.108.71","app":"PHP","message":"stream_copy_to_stream() expects parameter 3 to be integer, string given at \/usr\/share\/nginx\/owncloud_9_0_1\/3rdparty\/sabre\/http\/lib\/Sapi.php#78","level":3,"time":"2016-07-22T17:27:06+00:00","method":"GET","url":"\/remote.php\/webdav\/emulation\/Sega%20Saturn\/roms\/Enemy%20Zero%20(1996)(Sega)(JP).zip","user":"maxolasersquad"}
{"reqId":"\/YVZJZW\/Q62MT5eAWMja","remoteAddr":"98.230.108.71","app":"PHP","message":"stream_copy_to_stream() expects parameter 3 to be integer, string given at \/usr\/share\/nginx\/owncloud_9_0_1\/3rdparty\/sabre\/http\/lib\/Sapi.php#78","level":3,"time":"2016-07-22T19:29:15+00:00","method":"GET","url":"\/remote.php\/webdav\/emulation\/Sega%20Saturn\/roms\/Enemy%20Zero%20(1996)(Sega)(JP).zip","user":"maxolasersquad"}
{"reqId":"mxmQRbdzkQHmdCM6ZajG","remoteAddr":"98.230.108.71","app":"PHP","message":"stream_copy_to_stream() expects parameter 3 to be integer, string given at \/usr\/share\/nginx\/owncloud_9_0_1\/3rdparty\/sabre\/http\/lib\/Sapi.php#78","level":3,"time":"2016-07-22T21:31:19+00:00","method":"GET","url":"\/remote.php\/webdav\/emulation\/Sega%20Saturn\/roms\/Enemy%20Zero%20(1996)(Sega)(JP).zip","user":"maxolasersquad"}
{"reqId":"2U833xjATcbkRINvzjXl","remoteAddr":"","app":"PHP","message":"Exception: The requested uri() cannot be processed by the script '\/ocs\/v1.php') at \/usr\/share\/nginx\/owncloud_9_0_1\/lib\/private\/appframework\/http\/request.php#621","level":3,"time":"2016-08-03T22:04:40+00:00","method":"GET","url":"--","user":"--"}
{"reqId":"BvAM0wZu1J2sYIICTi0x","remoteAddr":"","app":"PHP","message":"Error: Call to undefined function OC\App\simplexml_load_file() at \/usr\/share\/nginx\/owncloud_9_0_1\/lib\/private\/app\/infoparser.php#60","level":3,"time":"2016-08-25T01:35:47+00:00","method":"GET","url":"--","user":"--"}
{"reqId":"BvAM0wZu1J2sYIICTi0x","remoteAddr":"","app":"PHP","message":"PHP Startup: Unable to load dynamic library '\/usr\/lib\/php\/20151012\/zip.so' - \/usr\/lib\/php\/20151012\/zip.so: cannot open shared object file: No such file or directory at Unknown#0","level":3,"time":"2016-08-25T01:35:47+00:00","method":"GET","url":"--","user":"--"}