open an SQLclient and go to the UM database (default name is HCUM)
Execute this statement:
update SETTING set SETTING_VALUE='true' where SETTING_FIELD='ADR_XML_INLINE_ATTACHMENT';
Restart service Unified-Messaging.
As of now, your attachment will be Base64-coded in the xml-export instead of being referred to as file-reference:
<Attachment>
<Content>dGVzdCBkb2N0b3I=</Content>
<Name>test.txt</Name>
<MimeType>plain/text</MimeType>
<FunctionalType>dma-rep</FunctionalType>
<Encoding>UTF-8</Encoding>
</Attachment>
instead of:
<Attachment>
<FileReference>ADR_202109249090900_3100002766192\test.txt</FileReference>
<Name>test.txt</Name>
<MimeType>plain/text</MimeType>
<FunctionalType>dma-rep</FunctionalType>
<Encoding>UTF-8</Encoding>
</Attachment>