In AEM 6.5 an integration with Target via Adobe I/O + IMS does not allow to export an Experience Fragment. It is a known limitation. We are expecting the fix in SP4
When exporting XF to a Target, you need to configure AEM Externalizer at /system/console/configMgr/com.day.cq.commons.impl.ExternalizerImpl
Exported XF will reside on AEM Publish and it has to be accessible via a correct URL