If recent or specific photos are not visible in [Photos] when uploading on Android, please check the following.
If old images are visible but recent images are not, check [Files].
If “High efficiency photo” is ON in camera settings, images are saved as HEIF and can be found in [Files] instead of [Photos].
Settings → Camera → Camera Settings → Picture formats
Turn OFF [High efficiency pictures]
After turning it OFF, photos will be available in [Photos].