Unable to send/receive pics in message app (US↔Japan)

I am in the US on T-Mobile, using a CMF Phone 1 (3.1.4). I can send/receive texts with associates in Japan, but photos fail to send/receive.

My T-Mobile plan enables me to text mobile numbers in Japan directly, and I followed T-Mobile’s recommended APN settings, but am unable to send pics.

I also found the recommended T-Mobile APN settings on this forum, but those don’t work, either.

I can send/receive pics with other phone users in the US, and other than this issue, I am not having any problems with messaging.

My understanding is that, when sending a pic to a recipient in Japan, the message app uses MMS, which requires that I am connected to my mobile network, as this won’t work on Wi-Fi only.

In my APN settings, I can see two T-Mobile settings:

T-Mobile US (I use this one)
fast.t-mobile. com

T-Mobile MMS (not selectable, but I can edit settings)
TMUS

I’m not sure my understanding is 100% correct, nor do I know how to resolve this issue. Any advice, suggestions, or commiseration would be greatly appreciated.

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