>what the hell does this mean? The message doesn’t exist, but I can copy its contents? If I can copy its contents…why can’t I save it?? If it doesn’t exist why do I have to discard it??
Maybe it should be even less descriptive.
"This message will soon no longer be available. Make sure you copy the contents of the message before you discard if you want to use them later."
Talking about the cache doesn't help the user. Really the solution is to add a button at the end of the message that says "save message contents to device." Then the message is clear and easily actionable.
The message could also give both this actionable advice and lisper's more technical explanation. You could label the more in-depth explanation or even put it on a second screen accessed via an 'advanced explanation' button.
Maybe it should be even less descriptive.
"This message will soon no longer be available. Make sure you copy the contents of the message before you discard if you want to use them later."
Talking about the cache doesn't help the user. Really the solution is to add a button at the end of the message that says "save message contents to device." Then the message is clear and easily actionable.