I often forget attachments. I have the alert on, but I tend to use "Here is the document" instead of a variation of "attach" as in "The document is attached".
Can I add the phrase "here is" to the missing attachment alerter?
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You cannot customize this yourself.
However, you can ask Google on their Product Forums to add this behavior
See this thread.
I think Gmail's
Email undo option can be useful in your case, as much as missing attachment is commonly noticed right after you sent an email.
Go to Settings. Click the Labs tab. Find the "Undo Send" lab and select the Enable radio button. Click Save Changes at the bottom of the page.
Help page about the subject Hope it helps somehow :)