android messages – Can send text with 4MB picture, but not smaller video

I searched quite a bit, but I didn’t find anyone having the same issue I am.

Phone is a oneplus 8t, carrier is t-mobile. US phone/plan, but I’m in Germany. Just using whatever the standard message app is.

Whether I’m on WiFi or network (4G only) I get an error that a 1.7mb video is too large, when I can, and did, send two pictures in a text to the same person, totaling 8.9mb. Tiny video file fials, large pictures succeed.

Just trying to understand why this happens.