I have the iOS version of lightroom and exported images lose some of the meta data. The main one being the lens model. This isn't ideal if I want to share those images to Flickr or 500px etc and has been an issue for a long time.
Is this something you are aware of and will you be fixing it?
What specifically are you referring to by "export"?
If you mean syncing with LR Web (also called LR Photos) in Adobe Creative Cloud, and then downloading photos from there, please add your vote and details about your issue to this bug report in the official Adobe feedback forum: Lightroom Web: EXIF metadata missing when downloading images from the web UI | Photoshop Family Customer Community
If you mean using Share from within the iOS LR app, then please file a new bug report: Photoshop Lightroom | Photoshop Family Customer Community
Or do you mean something else?