Appian to Receive External Document Link

Is there a way for Appian to receive an external document download link and convert that to a document stored on Appian?

I have tried using the "Document Upload" Web API template without success

I have also tried using an integration object and converting binary to Appian document but got an error saying that my url doesn't match "[*.appiancloud.com, appiancloud.com]"

Any suggestions here would be appreciated.

Thanks

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