Hi JG,
You’ve already covered the main local troubleshooting steps, including reinstalling the apps, re-pairing Bluetooth, and installing available updates.
At this point, I’d recommend submitting the failed transfer through Feedback Hub (Windows + F) and including the exact error message and the fact that transfers worked only immediately after the initial setup. That information can help with investigating behavior that persists after local troubleshooting.
Please note that this is a user-to-user support forum. Moderators, contributors including external Microsoft employees cannot directly intervene in Microsoft product features or access back-end systems. Our role is limited to providing technical guidance on reported issues, requests, or ideas.
For now, using a USB connection to import the photos is worth considering as a temporary workaround.
I hope this points you toward a useful next step.