Error Message: 
“Oops something went wrong 🙁 Error: Invalid ID.”

-This error can happen for any of the following reasons:

a) “Email To” field in document action is not the correct Lead or Contact ID merge field.
How to resolve:
See help text below email section in document action for more detail on how to build this merge field or email contact. You can also revisit this article which has more detail of setting up the email section in document action. Or if using document action for automation, please review this article.
b) May be issue with Google Doc ID, Google Drive Folder ID, or Email Template ID that you pasted in document action.
How to resolve:
Cross check all the ID’s to make sure no extra symbols, letters, or numbers and in proper format per this article. Note that all email template ID’s start with “OOX.”
c) Issue with trying to use a list button rather than custom button attached to an object layout, error is coming from base object API.
How to resolve:
See this FAQ for more information.