Hi!
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It looks like an internal directory. You can copy the image file to e.g. Application.persistentDataPath, if you want to access it via the file browser. You can also use NativeGallery to save the image to gallery: Native Gallery for Android & iOS [Open Source]
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It sounds like a shader issue. If you are using a scriptable render pipeline (LWRP or HDRP), try adding a cube object to your test scene and see if it resolves the issue.