I recently created my own off-line map using MOBAC on my Linux system.
I successfully uploaded the same sqlite file (not gzipped) via iTunes to L4C and that worked well.
However, I tried uploading the sqlite file to my OwnCloud and it would not open in L4C when using the OwnCloud IOS app.
I tried gzipping the sqlite file but no go - I get asked if I want 'email' or 'copy' to open it. L4C is not suggested as an option.
I have successfully uploaded a GeoCache.com Pocket Query gzip file to OwnCloud and L4C successfully opens that, via the OwnCloud IOS app. I was wondering if there was a way I could transfer the MOBAC atlas in the same way, using OwnCloud, it would save me having to boot up windows to run iTunes!