Apparently there is a limitation on virus scanning when uploading files to SharePoint Online / ODFB I was not aware of. Basically, any file larger than 25 MB is not analyzed when it’s uploaded to SPO / ODFB. Source: https://support.office.com/en-us/article/Virus-detection-in-SharePoint-Online-e3c6df61-8513-499d-ad8e-8a91770bff63
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