Invoking import file action

Can I trigger File Import from outside a COT application (from a REST, add record service call?) and take advantage of using csv/xls/xlsx input file types and generating an error report as I would from the Touch UI action?

Is there possibly a way to invoke Import File directly (from outside a COT application, Microsoft Flow, for instance), without needing to use db-based triggers such as inserting rows?

Can/should NodeSet be used in this case (if so, I couldn't figure out the right approach)?

Thank you in advance
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