Google Photos technical help

1. Google photos stopped updating new photos. When I looked up what to do about this, it says to go to Google photos, select settings, and then select sync. The only "sync" under settings is "sync with google drive." Is that what I'm supposed to select? I was expecting a "sync with phone/devices" option.

2. All my photos from 2015 - mid 2017 are duplicated on Google photos. Is it safe to delete the duplicates, or will that also delete the originals on my phone when I sync the devices? They're not duplicated on my phone.

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