Who I have the same questioned this topic

In the past, I'd be able to send a video I recorded on my phone via Message+ that was up to a minute long.  Now, not knowing what changed, the limit is capped at 15 seconds.  It even says "MMS: 1 minute duration.  Trim as desired".  My video is less than a minute, but more than 15 seconds.  It only lets me make a selection of any 15 second span or "trim" the 15 seconds shorter.

I even went back to videos I know I had sent before that were well over 15 seconds.  But now those are also constricted to only 15 seconds.

I don't know what changed.