Just to be clear, here’s what happens when an image is uploaded to iNat:
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If it is larger than 2048 x 2048 pixels, it is resized so that its longest edge will be no longer than 2048 pixels. On mobile devices this is done before an image is uploaded (to save on data use) and on the web, this is done after the image is uploaded.
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Metadata is recorded by iNaturalist and then the image itself is stripped of all metadata. The metadata is displayed on the photo’s page, including date, time, and GPS coordinates (eg https://www.inaturalist.org/photos/31404586) unless…
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…the photo is linked to an observation which has obscured or private coordinates. Then date, time, and GPS info can only be seen by the observer when they are logged in (eg I can see that info here, but you shouldn’t be able to)
Rather than time, perhaps file name can be used?