As you are not able to view previews on your iPhone 7.
Are you getting any error?
May I know which version of Lightroom Mobile are you using?
Please follow this post and let us know if it helps Preview Unavailable for iPhone 7 DNG file
It looks like the linked post has issues with previews on the pc. My issue is with previews on the phone with files I've taken on SLRs, edited on Adobe and designated to sync from the pc (mac really) to my mobil acct. The version is CC on all devices and affects DNGs and other formats.
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Hi Paul, does it help to re-sign-in to the Lr Mobile app? - Guido
The re-sign-in did not work, but I removed and replaced the app and that seemed to fix the issue.
Thanks for your time.