In the container there is a catalina.2018-10-10.log in the logs dir of tomcat:
root@xwiki-test-0:/usr/local/tomcat/logs# ls -la
total 192
drwxrwxrwx 1 root root 4096 Oct 10 08:56 .
drwxr-sr-x 1 root staff 4096 Sep 12 21:41 ..
-rw-r----- 1 root root 13073 Oct 10 09:22 catalina.2018-10-10.log
-rw-r----- 1 root root 0 Oct 10 08:56 host-manager.2018-10-10.log
-rw-r----- 1 root root 0 Oct 10 08:56 localhost.2018-10-10.log
-rw-r----- 1 root root 160446 Oct 10 13:51 localhost_access_log.2018-10-10.txt
-rw-r----- 1 root root 0 Oct 10 08:56 manager.2018-10-10.log
That contains nothing about the file or the upload.
root@xwiki-test-0:/usr/local/tomcat/logs# cat catalina.2018-10-10.log
10-Oct-2018 08:56:14.255 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server version: Apache Tomcat/8.5.34
10-Oct-2018 08:56:14.257 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server built: Sep 4 2018 22:28:22 UTC
10-Oct-2018 08:56:14.257 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server number: 8.5.34.0
10-Oct-2018 08:56:14.257 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log OS Name: Linux
10-Oct-2018 08:56:14.257 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log OS Version: 4.15.0-34-generic
10-Oct-2018 08:56:14.257 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Architecture: amd64
10-Oct-2018 08:56:14.257 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Java Home: /usr/lib/jvm/java-8-openjdk-amd64/jre
10-Oct-2018 08:56:14.257 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log JVM Version: 1.8.0_181-8u181-b13-1~deb9u1-b13
10-Oct-2018 08:56:14.257 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log JVM Vendor: Oracle Corporation
10-Oct-2018 08:56:14.258 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_BASE: /usr/local/tomcat
10-Oct-2018 08:56:14.258 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_HOME: /usr/local/tomcat
10-Oct-2018 08:56:14.258 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties
10-Oct-2018 08:56:14.258 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
10-Oct-2018 08:56:14.258 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djdk.tls.ephemeralDHKeySize=2048
10-Oct-2018 08:56:14.258 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.protocol.handler.pkgs=org.apache.catalina.webresources
10-Oct-2018 08:56:14.258 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dorg.apache.catalina.security.SecurityListener.UMASK=0027
10-Oct-2018 08:56:14.258 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Xmx1024m
10-Oct-2018 08:56:14.258 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dorg.apache.tomcat.util.buf.UDecoder.ALLOW_ENCODED_SLASH=true
10-Oct-2018 08:56:14.259 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dorg.apache.catalina.connector.CoyoteAdapter.ALLOW_BACKSLASH=true
10-Oct-2018 08:56:14.259 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dsecurerandom.source=file:/dev/urandom
10-Oct-2018 08:56:14.259 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dignore.endorsed.dirs=
10-Oct-2018 08:56:14.259 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcatalina.base=/usr/local/tomcat
10-Oct-2018 08:56:14.259 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcatalina.home=/usr/local/tomcat
10-Oct-2018 08:56:14.259 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.io.tmpdir=/usr/local/tomcat/temp
10-Oct-2018 08:56:14.259 INFO [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent Loaded APR based Apache Tomcat Native library [1.2.17] using APR version [1.5.2].
10-Oct-2018 08:56:14.259 INFO [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true].
10-Oct-2018 08:56:14.259 INFO [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent APR/OpenSSL configuration: useAprConnector [false], useOpenSSL [true]
10-Oct-2018 08:56:14.265 INFO [main] org.apache.catalina.core.AprLifecycleListener.initializeSSL OpenSSL successfully initialized [OpenSSL 1.1.0f 25 May 2017]
10-Oct-2018 08:56:14.324 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["http-nio-8080"]
10-Oct-2018 08:56:14.332 INFO [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read
10-Oct-2018 08:56:14.337 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["ajp-nio-8009"]
10-Oct-2018 08:56:14.338 INFO [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read
10-Oct-2018 08:56:14.339 INFO [main] org.apache.catalina.startup.Catalina.load Initialization processed in 347 ms
10-Oct-2018 08:56:14.360 INFO [main] org.apache.catalina.core.StandardService.startInternal Starting service [Catalina]
10-Oct-2018 08:56:14.360 INFO [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.5.34
10-Oct-2018 08:56:14.367 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/usr/local/tomcat/webapps/ROOT]
10-Oct-2018 08:56:25.269 INFO [localhost-startStop-1] org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
10-Oct-2018 08:56:37.226 INFO [localhost-startStop-1] org.artofsolving.jodconverter.office.ProcessPoolOfficeManager.<init> ProcessManager implementation is LinuxProcessManager
10-Oct-2018 08:56:37.245 INFO [OfficeProcessThread-0] org.artofsolving.jodconverter.office.OfficeProcess.start starting process with acceptString 'socket,host=127.0.0.1,port=8100,tcpNoDelay=1' and profileDir '/usr/local/tomcat/temp/.jodconverter_socket_host-127.0.0.1_port-8100'
10-Oct-2018 08:56:37.254 INFO [OfficeProcessThread-0] org.artofsolving.jodconverter.office.OfficeProcess.start started process; pid = 98
10-Oct-2018 08:56:37.535 WARNING [OfficeProcessThread-0] org.artofsolving.jodconverter.office.ManagedOfficeProcess$6.attempt office process died with exit code 81; restarting it
10-Oct-2018 08:56:37.542 INFO [OfficeProcessThread-0] org.artofsolving.jodconverter.office.OfficeProcess.start starting process with acceptString 'socket,host=127.0.0.1,port=8100,tcpNoDelay=1' and profileDir '/usr/local/tomcat/temp/.jodconverter_socket_host-127.0.0.1_port-8100'
10-Oct-2018 08:56:37.553 INFO [OfficeProcessThread-0] org.artofsolving.jodconverter.office.OfficeProcess.start started process; pid = 108
10-Oct-2018 08:56:37.856 INFO [OfficeProcessThread-0] org.artofsolving.jodconverter.office.OfficeConnection.connect connected: 'socket,host=127.0.0.1,port=8100,tcpNoDelay=1'
10-Oct-2018 08:56:39.118 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/usr/local/tomcat/webapps/ROOT] has finished in [24,751] ms
10-Oct-2018 08:56:39.123 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["http-nio-8080"]
10-Oct-2018 08:56:39.171 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["ajp-nio-8009"]
10-Oct-2018 08:56:39.199 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in 24860 ms
10-Oct-2018 09:22:13.529 WARNING [http://wiki.statistik-experten.de/bin/download/FlamingoThemes/Iceberg/logo.svg] org.apache.catalina.connector.Response.setCharacterEncoding The encoding [] is not recognised by the JRE
java.lang.IllegalArgumentException: java.io.UnsupportedEncodingException: The character encoding [] is not supported
There’s also an access log. But there, too, is nothing about the upload:
10.42.128.0 - - [10/Oct/2018:13:49:10 +0000] "POST /bin/loginsubmit/XWiki/XWikiLogin HTTP/1.1" 302 -
10.42.128.0 - - [10/Oct/2018:13:49:11 +0000] "GET /bin/view/Sandbox/ HTTP/1.1" 200 50843
10.42.128.0 - - [10/Oct/2018:13:49:11 +0000] "GET /webjars/wiki%3Axwiki/xwiki-platform-tree-webjar/10.7/tree.min.css?evaluate=true HTTP/1.1" 200 31469
10.42.128.0 - - [10/Oct/2018:13:49:11 +0000] "GET /bin/get/Sandbox/WebHome?xpage=xpart&vm=commentsinline.vm HTTP/1.1" 200 3076
10.42.128.0 - - [10/Oct/2018:13:49:11 +0000] "GET /webjars/wiki%3Axwiki/xwiki-platform-tree-webjar/10.7/require-config.min.js?evaluate=true HTTP/1.1" 200 350
10.42.128.0 - - [10/Oct/2018:13:49:11 +0000] "GET /bin/download/Sandbox/WebHome/XWikiLogo.png HTTP/1.1" 404 23916
10.42.128.0 - - [10/Oct/2018:13:49:11 +0000] "GET /bin/get/XWiki/Notifications/Code/NotificationsDisplayerUIX?outputSyntax=plain&action=getUnreadCount&_=1539179350732 HTTP/1.1" 200 12
10.42.128.0 - - [10/Oct/2018:13:49:11 +0000] "GET /bin/get/TourCode/TourJson?xpage=plain&outputSyntax=plain&tourDoc=Sandbox.WebHome HTTP/1.1" 200 12
10.42.128.0 - - [10/Oct/2018:13:49:11 +0000] "GET /bin/get/Sandbox/WebHome?outputSyntax=plain&sheet=XWiki.DocumentTree&showAttachments=false&showTranslations=false&root=document%3Axwiki%3ASandbox.WebHome&showRoot=true&data=children&id=%23 HTTP/1.1" 200 439
10.42.128.0 - - [10/Oct/2018:13:49:11 +0000] "GET /bin/get/Sandbox/WebHome?outputSyntax=plain&sheet=XWiki.DocumentTree&showAttachments=false&showTranslations=false&exclusions=document%3Axwiki%3ASandbox.WebHome&exclusions=document%3Axwiki%3AHelp.WebHome&exclusions=document%3Axwiki%3AXWiki.WebHome&exclusions=document%3Axwiki%3AMenu.WebHome&data=children&id=%23HTTP/1.1" 200 425
10.42.128.0 - - [10/Oct/2018:13:49:11 +0000] "GET /bin/get/Sandbox/WebHome?outputSyntax=plain&sheet=XWiki.DocumentTree&showAttachments=false&showTranslations=false&exclusions=document%3Axwiki%3ASandbox.WebHome&exclusions=document%3Axwiki%3AHelp.WebHome&exclusions=document%3Axwiki%3AXWiki.WebHome&exclusions=document%3Axwiki%3AMenu.WebHome&data=path&id=document%3Axwiki%3ASandbox.WebHome HTTP/1.1" 200 439
10.42.128.0 - - [10/Oct/2018:13:49:14 +0000] "GET /bin/get/Sandbox/WebHome?xpage=xpart&vm=attachmentsinline.vm HTTP/1.1" 200 2512
10.42.224.0 - - [10/Oct/2018:13:49:17 +0000] "GET /bin/view/Main/ HTTP/1.1" 200 37926