Something more is going on here. I just tried to view a PDF on owncloud via the web UI and got this message:
PDF.js v1.10.0 (build: 55734b2)
Message: Unexpected server response (500) while retrieving PDF "https://www.example.com/remote.php/webdav/ownCloud_Server_Administration_Manual.pdf".
Plot is getting thicker. If I try to download any files I get an error:
" Internal Server Error"
Looks like a Redis issue. Looking closer.
Found this in the log:
“message”:"Exception: MISCONF Redis is configured to save RDB snapshots, but it is currently not able to persist on disk. Commands that may modify the data set are disabled, because this instance is configured to report errors during writes if RDB snapshotting fails (stop-writes-on-bgsave-error option). Please check the Redis logs for details about the RDB error.: {“Exception”:“RedisException”,“Message”:"MISCONF Redis is configured to save RDB snapshots, but it is currently not able to persist on disk. Commands that may modify the data set are disabled, because this instance is configured to report errors during writes if RDB snapshotting fails (stop-writes-on-bgsave-error option). Please check the Redis logs for details about the RDB error