Thanks @ghenxx,
For some reason these particular files are not being downloaded as the same size they are reported being by Slack. I’m not sure if slack just has it wrong, or that these files were uploaded in some way to make them have an incorrect size.
It sounds like the Google Camera app is the common link for these files. Is that correct?
If you upload a new photo from the same app, does it create the issue?
What happens if you download a picture having issues (from within the Slack app on the web, for example) and then re-upload with the Slack app? Is that file able to be downloaded via odrive?