how to get a file from other system (no SAP system) via Sap cloud platform?

Dear,

for business reason we d like to get in our system SAP an external file ( XML format) and retrieve this file via SAP Cloud platform.

So, system A will create a file XML that will be available (accessible via FPT) and system B (SAP) has to get this file and read the file XML.

can someone tell me which service i have to use and if there is any manual for something similar?