crazysally cbisher
Before I switched to using RCS texting, groups text and pictures (MMS) would silently fail sometimes and not download, annoying.
So, if I was in a group text with a few people, I'd have to periodically look at the individual conversations with sarah, matt, etc to see if any texts failed from them for the group chat and tap download.
As you experienced, if I missed it and waited too long to download the message then the message expires, normal behavior. Rarely, I'd have a fresh, downloadable message fail to download, a bug.
You could try using a different SMS/MMS texting app like these:
Or switch to RCS with google messages. I haven't had any issues with RCS.