Do you mean to use the upload function on the web portal to upload the url? I found no relevant information. The report server's Web portal provides upload functionality so that reports and other files can be added to the report server without having to publish the items from the client application. You can check this link: https://learn.microsoft.com/en-us/sql/reporting-services/reports/upload-a-file-or-report-report-manager?view=sql-server-ver16.
How about creating a report and adding a hyperlink to the URL in the report? Please check this link: https://learn.microsoft.com/en-us/sql/reporting-services/report-design/add-a-hyperlink-to-a-url-report-builder-and-ssrs?view=sql-server-ver16.
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Aniya