you can't watch videos that are older than a certain period
My understanding is that's not true anymore it's been fixed.
I posted MY 1st Swarm May 29 2018. True it was lost for a while, meaning it played for a while after uploading but after some time it stopped working. Then they made a change to how they were storing and paying for that storage. I don't remember the details but it made sense to me.
Shortly after this change I checked MY 1st Swarm and it was back!
I just checked it now, it still works, it started choppy but played to the end.
Before I wrote this I checked some of @modernpastor 's videos which are a couple of months old and they didn't work.