Fetch updated files with sFTP adapter (PI7.30 SP05)

Hi,

We are running SAP PI 7.30 SP05.

I want to fetch updated files from a sFTP server with the sFTP adapter, either:

1. Files updated since latest run, or
2. Files updated during the latest 7 hours (number of hours should be configurable).

Both alternative 1 and 2 works. My problem is that I don't know how to configure the adapter to fetch updated files only.

Thanks in advance!

Regards

Emely