AttachmentExtractor fails to upload files exeeding two megabytes of size (The actual size being blockes depends on various parameters and might actually be lower than the set value).
Check, if you see a message similar to the following in the event log or the log overview of the service configuration:
The request message is to big. The server does not allow messages larger than 2097152 bytes.
This is indicating, that the default upload method is not working due to server side message size restrictions.
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