In addition to what @bouteloua and @cmcheatle already said, it’s pretty explicitly spelled out in the FAQ/Help page:
“Photos attached to observations should include evidence of the actual organism at the time of the observation, observed by the user who is uploading the observation. Photos used in your iNaturalist observations should represent your own experiences, […]Please do not upload photos you found elsewhere[…]”
From https://www.inaturalist.org/pages/help#observations8 , emphasis and ellipsis added
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