Yes. I have used it many times and it always comes out great but for some reason this time I can't get some of the pictures and video to download onto the sd card. Yeah not too many people have the spark these days, but im a beginner pilot so this one is nice to use.
In the app (Go4 when viewing photos / videos, can you download any of those files by wifi ?
I pretty much always do this for all photos, most video (short clips) while packing up, often landing with 25%
battery or so.
It's a bit slower but works for me every time.
All I can suggest next is checking contacts on the mSD card if it's older, clean in there, no dust etc ?
Push in / out a few times, but if still a problem, maybe try another card as a precaution.
They can and do fail, though usually fairly rare . . . I've never had one fail me.
The cached images / video are on the viewing device cache storage, so it's possible just a microSD issue.
Best to eliminate that possibility as a cheap-ish possible fix.
Without knowing the background of the Spark (2nd hand, past heavy use) etc, it's possible some sort of hardware failure is starting to occur.