Unable to show the image file from UCM server in BIP report in pdf output (in html its comming )

Summary:

We are storing signatures in Document of records and we need to pull these signatures in the report output which is in pdf format.

Content (please ensure you mask any confidential information):

We are able to fetch the signature file from UCM content server through BIP using dynamic image URL and also able to populate the image when we run the report in html format. But when we try to run the same report for pdf format, image is not getting populated.

On verifying the diagnostics, it says  "Failed to load the image:.."

Any inputs to show the imagine in pdf output will be highly appreciated.