The files on Lightroom mobile are not exported files. They're lossy DNG versions of the originals (like Smart Previews), so are effectively still Raw (assuming your original files are Raw). Hence there's no profile in the file. Mobile devices aren't coloured managed, so there's no way to control how colour renders on them.
If you're colour managed on the desktop, they should still look reasonably similar.
If you go to Instagram from LR mobile, are they still washed out?
Thanks for replying Sean.
Yeah, it's still washed out when I upload it to Instagram. Perhaps "washed out" is an exaggeration but there's definitely a difference
I've just been comparing the images from the different sources...
The first image here is the export from LR with sRGB
The second image is the file I downloaded from LR mobile app and then emailed to myself.
The third is the image I've pulled from the my.portfolio site (I'd say it looks identical to image number 2)
Perhaps the solution is just to export from LR and then upload to .portfolio and instagram separately?
Just curious...the phone that's running Lightroom Mobile, what mobile operating system is it running?
It's an iPhone 6 running version 10.0.2