Send Email"" Button with custom text and fields

Quick Base will not natively send an email with an attachment.  You can however, trigger an email with a link to an attachment that can be viewable without needing to sign into Quick Base, ie for outside recipients without a Quick Base userid.

If you absolutely need to be able to trigger an email and include an attachment which is stored as a file attached to a Quick Base record, there are 3rd party solutions like this one from Juiced which will do that.  

https://www.juicedtech.com/courier