[Zubersoft]

I'll look into it. If you instead use Share->Export Files->Local File, does that name the files like you would expect? That's what I generally use for exporting to the local file system, as it's much faster and more straightforward than using Google's file picker (which forces me to go through their awful storage access framework). I'm assuming the problem is related to the SAF, but I'll have to do more testing to verify that.

Mike