Exporitng high res files from phone / tablet

The main reason I subscribed to Pro was so I can export fulle resolution files to dropbox for my work. Although I shoot in 24mega pixel I xan only export from Loghtroom Pro at 72 dots per inch which is crap for anything other than Instagram and FB. Nonsense. I thought this was software for real photographers. Why isn't this a feature? If anyone knows a hack or workaround please let me know. It's pointless without such a basic feature as I can't make prints or use the images for anything proper!