I respect that you have the remote content allowed set, but your recipient may not. Anyway, that's my perception of the issue and possibly why the remote content isn't being transmitted.

Same receiving client in use that worked with Outlook forwards. TB sent folder message looks just like what the receiver of the forward sees, message has been stripped with no option to view remote content.

Maybe the remote content is some non-standard attachment format. Can you share a sample email?

Its just post office informed delivery scanned pictures of daily mail. I have exceptions set for https://informeddelivery.usps.com and https://www.usps.com. The exceptions work perfectly for the inbox but apparently the message forward rule happens before the exceptions?

Exceptions are for display only. Exceptions will never impact forwarding.

When tested exceptions do affect manually forwarded email. Exceptions are not affecting message filter rule that forwards the message. So I'm having to manually forward messages that I want offline content to appear in the forwarded message.