SYMPTOM
In Strategy Web, when user try to create a subscription or schedule to refresh the data import cubes which are created using "File From Disk", the below error message is returned:
A schedule cannot be created on this dataset as all the tables were either built from "File From Disk" or "Clipboard" connectors, therefore returning manual data input, or were created via the Strategy Data Push API.

CAUSE:
This is a known limitation in Strategy with scheduling the refresh of "File From Disk" data import cubes.
ACTION:
This issue was reviewed by our Technology team for feasibility and will not be scoped for a code fix in any upcoming Strategy release.
WORKAROUND:
Create the data import cube using "File From URL" instead, which support scheduling the refresh of data import cubes.
This issue has been logged as Scopus ID: 256192 and KB441490