Hi @softyoda
This is a bug: Unreal Engine Issues and Bug Tracker (RC-1881)
You can try to use two workarounds:
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Resave the JPG images to a different format. The image may lose EXIF metadata, such as the focal length, but that can be manually edited in RealityCapture.
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If you have the original RAW images, develop the images to a different format than JPG without the loss of EXIF metadata.