What does this mean, "download failed because storage location is not reachable"?

[Android Central Question]

I've been using my sd card for more than a year and had no problem with it. Recently when I am downloading an mp4 file, donloading paused so I just tap Continue but it stopped and then this message appeared :
"(filename) download failed because storage location is not reachable."
I restarted the phone and tried to dl again, said it was successful but when I tried to play it, nothing happened (file didn't play bec playtime is 0:00) and I can't find it in my sd.
All settings were correct so I can't figure what seems to be the problem.

Help please.

 

[B. Diddy]

Welcome to Android Central! What app or site are you downloading the mp4 file from? Have you tried a different SD card?

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[mustang7757]

Which device?
Is your storage full?