Will there be any issue in using document viewer after DB encryption?

> Document Viewer does not support inline viewing in your situation. The possible reasons are:

1. The document uploaded is platform encrypted or edge encrypted.

> Document Viewer does not support FedRAMP instances, instances that are on-premise, or instances that use Encryption Support.

https://docs.servicenow.com/bundle/orlando-platform-user-interface/page/use/using-forms/concept/Documentviewer.html

https://docs.servicenow.com/bundle/orlando-platform-user-interface/page/use/using-forms/task/view-attachment-doc-viewer.html#view-attachment-doc-viewer

Doc viewer requests will be processed by different server which is group docs, if the attachment is edge encrypted then you can't render it inline using doc viewer .