Kibana version: 7.5.1

Elasticsearch version: 7.5.1

Server OS version: darwin_x86_64

Browser version: chrome latest

Browser OS version: OS X

Original install method (e.g. download page, yum, from source, etc.): from staging

Describe the bug: The copy post URL link on canvas under sharing doesn't have workpad and other details.

Steps to reproduce:

1. Open a canvas workpad
2. Click on share button->PDF reports - and then -> Copy post URL
3. User gets this - http://localhost:5601/api/reporting/generate/printablePdf without any details of workpad which user wants to share.

Screenshots (if relevant):