Saving PDF error

Hello!
When I try to save a PDF file, I receive the following message:

At the moment, PDF viewer can only save new changes in separate file copies. It doesn’t support co-editing and other users won’t see your changes unless you share a new file version.

and a download button.
How do I make it save in the callbackUrl?

Hello @faigalizade

In current version 8.1 saving of PDF via callback is not implemented. It will be available in next version 8.2 within few weeks.