I've added photos to the OneDrive app for IOS. There are preview on the app but once I check the OneDrive folder in my PC, no previews.
To better understand and help you resolve the issue please let us know from where exactly did you upload the photos, Is it through the OneDrive app on your Mac or through a web browser.
If you have used your web browser it might be a sync issue with OneDrive.
I suggest you to try the troubleshooting steps in the link below and see if it helps to resolve the issue.
Hope this helps.
Please get back to us with the issue related to photos in OneDrive and we will be happy to assist you.
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