Hello
I try send a message via pushover with a attachment but i get this error. I think i got the path wrong but cant figure out the right path 
I am useing OH3 in a docker Container
val actions = getActions("pushover", "pushover:pushover-account:default")
actions.sendAttachmentMessage("Door Bell Rung", "Door Bell Rung", "/opt/openhab/userdata/Frontdoor.jpg","")
08:07:40.802 [WARN ] [core.internal.scheduler.SchedulerImpl] - Scheduled job failed and stopped
java.lang.IllegalArgumentException: Skip sending the message as file '/opt/openhab/userdata/test.txt' does not exist.
at org.openhab.binding.pushover.internal.connection.PushoverMessageBuilder.build(PushoverMessageBuilder.java:244) ~[?:?]
at org.openhab.binding.pushover.internal.connection.PushoverAPIConnection.sendMessage(PushoverAPIConnection.java:78) ~[?:?]
at org.openhab.binding.pushover.internal.handler.PushoverAccountHandler.sendMessage(PushoverAccountHandler.java:137) ~[?:?]
at org.openhab.binding.pushover.internal.actions.PushoverActions.send(PushoverActions.java:208) ~[?:?]
at org.openhab.binding.pushover.internal.actions.PushoverActions.sendAttachmentMessage(PushoverActions.java:125) ~[?:?]
at org.openhab.binding.pushover.internal.actions.PushoverActions.sendAttachmentMessage(PushoverActions.java:130) ~[?:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?]
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:566) ~[?:?]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.invokeOperation(XbaseInterpreter.java:1176) ~[?:?]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.invokeOperation(XbaseInterpreter.java:1151) ~[?:?]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._invokeFeature(XbaseInterpreter.java:1137) ~[?:?]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.invokeFeature(XbaseInterpreter.java:1082) ~[?:?]
at org.openhab.core.model.script.interpreter.ScriptInterpreter.invokeFeature(ScriptInterpreter.java:151) ~[?:?]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate(XbaseInterpreter.java:862) ~[?:?]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.doEvaluate(XbaseInterpreter.java:232) ~[?:?]
at org.openhab.core.model.script.interpreter.ScriptInterpreter.doEvaluate(ScriptInterpreter.java:226) ~[?:?]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:216) ~[?:?]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate(XbaseInterpreter.java:459) ~[?:?]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.doEvaluate(XbaseInterpreter.java:240) ~[?:?]
at org.openhab.core.model.script.interpreter.ScriptInterpreter.doEvaluate(ScriptInterpreter.java:226) ~[?:?]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:216) ~[?:?]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.evaluate(XbaseInterpreter.java:202) ~[?:?]
at org.eclipse.xtext.xbase.interpreter.impl.ClosureInvocationHandler.doInvoke(ClosureInvocationHandler.java:47) ~[?:?]
at org.eclipse.xtext.xbase.interpreter.impl.AbstractClosureInvocationHandler.invoke(AbstractClosureInvocationHandler.java:30) ~[?:?]
at com.sun.proxy.$Proxy402.apply(Unknown Source) ~[?:?]
at org.openhab.core.model.script.actions.ScriptExecution.lambda$0(ScriptExecution.java:82) ~[?:?]
at org.openhab.core.internal.scheduler.SchedulerImpl.lambda$12(SchedulerImpl.java:166) ~[bundleFile:?]
at org.openhab.core.internal.scheduler.SchedulerImpl.lambda$1(SchedulerImpl.java:76) [bundleFile:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) [?:?]
at java.util.concurrent.FutureTask.run(FutureTask.java:264) [?:?]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304) [?:?]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
at java.lang.Thread.run(Thread.java:834) [?:?]