How do i upload DWAPI data using Differential upload feature

Differential data upload into National Data Warehouse is now possible with DWAPI tool. Differential upload is where a facility only uploads new records that were created/updated since the last successful DWAPI upload. This technology largely saves time and internet resources.
For the technology to work effectively, the flowing conditions have to be met:

1. A facility has to Send All data at least once before using the differential feature in subsequent uploads. This applies also to new KenyaEMR and DWAPI installations and Reinstallations.
2. ETL has to be recreated prior to extracting data into DWAPI
3. For offsite (boardroom) DWAPI uploads, ETL table MUST be recreated prior to data extraction into DWAPI.