Beginners Guide 220.127.116.11
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Aerial imagery will, regardless of source, have offsets to the real positions of objects on the ground. While this can be small enough to be ignored, it can be substantially more than typical GPS errors (>> 10 meters) and change over small areas (requiring re-adjustment). It is mandatory that you check this before moving existing OSM data, or adding more.
Potential ways to align and check alignment:
Enable aerial imagery
Unaligned Mapbox or Bing imagery will be displayed for you.
Align aerial imagery
Main article: Using_Imagery#ID
The imagery offset is not stored between sessions