Already asked the question in the mailing list. Claus Ibsen stated that this is actually a bug:
Yes that seems like a little bug. You are welcome to create a JIRA ticket.
Here is my description of the bug:
We are currently trying to integrate azure cloud by using the camel-azure-storage-blob component. Everything works fine until we activate stream caching and camel starts to spool the payload. In this case we get the following error:
Caused by: java.lang.IllegalArgumentException: InputStream of body exchange does not support mark/rest operations.
I have looked into the source and think that the component does not load the stream properly from the FileInputStreamCache object.