Error while creating message using Gmail account

I am attempting to email a PDF form from Reader DC Version 2019.012.20040 using an 'email' button on the form. In the application preferences, I have set the Default email application to my Gmail account after using the 'Add Account' button on the 'List of Email Accounts' page and selecting 'Add Gmail'. When I select the 'eMail' button (which is of the type 'Submit Form' and has in the 'Submit to URL:' field mailto:name@email.com), a dialog appears at the bottom of the screen with the message 'Preparing to Send Message'. This quickly changes to another that indicates my gmail account and says 'connecting' . This then - very quickly - changes to yet another that says 'name@gmail.com:  creating draft message' (and clearly, I'm using generic names here for security purposes) with a moving bar indication "something" is happening before it disappears to be replaced by an error message dialog headed 'Acrobat Reader' and an informational message 'Error while creating message.' This will stay on screen until I click OK when another error message replaces it. This has the white X on a red background indicating a more serious error and says 'Error while creating message. If you are not sure how to proceed further, you can save your form and return it manually using your Internet mail service'. Clicking OK leaves me where I started. Now here is the strange thing. If I choose to use another email application (which just happens to be Thunderbird), a draft message IS created with the form attached and all fields correctly filled, and it can be sucessfully sent and consequently read. So - clearly the button works - but NOT with Gmail. I have tried on other computers and Gmail never works, but, for example, Outlook does. I am running Windows 10 Pro 64 bit as an OS. I have seen similar questions to this before, but never an answer that even goes close to solving the problem - so I'd appreciate any assistance available. Given the proliferation of Gmail in the community, it is really important that the form can be sent from a Gmail account and NOT just from an email application (and since Adobe specifically have Gmail as an addition, it really should work!), so please, don't suggest that as a solution. Thanks......