Yes, you can share manual URL or QR code by email or via your social media account, chat, etc.
However, to view manuals released in internal folder, you must be logged into Teachme Biz and have permission to access the folder where manual is located.
----
Related: What is the difference between internal and public folder?
https://help.teachme.jp/hc/en-us/articles/900007185943
Related: What should I do if the "Content cannot be displayed as this folder is not released." error was displayed when viewing public manual?
https://help.teachme.jp/hc/en-us/articles/900005508166