There are many other threads on this topic, but I haven’t been able to find the answer for my specific issue.
When I send an email from Gmail to <my_number>@tmomail.net, it shows up in my Android phone Messages with my gmail address as the From field (so a message thread is created as <my_gmail_addr>, but there is no text in the message. Instead it just shows a download icon and “Tap to download”. But tapping to download just spins briefly then returns to “Tap to download”.
This behavior is the same whether I send the email directly from Gmail, or via Thunderbird, or from an automation on IFTTT.
Is there a way to get this to work?