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Based on your description, I understand that you're encountering an issue where files linked through the Quick Links web part in SharePoint Online cannot be downloaded or deleted when accessed via the SharePoint mobile app on iOS or Android.
As far as I know, this behavior is a known limitation of the SharePoint mobile app. The Quick Links web part is primarily designed for navigation and does not fully support file-level interactions, such as downloading or deleting documents on mobile platforms. When a file is linked through Quick Links, the mobile app may not recognize it as an actionable file object. Instead, it treats the link as a generic reference, and if the app cannot resolve the file metadata or access path properly, it displays a fallback error like "Couldn't load object." This is especially common when linking directly to documents or folders rather than to pages or document libraries.
To address this, I recommend using a Document Library web part instead of Quick Links when your goal is to provide mobile users with access to files. The Document Library web part is optimized for file interactions and supports downloading, deleting, and previewing documents directly within the SharePoint mobile app.
Hope my answer will help you, if the issue still persists, let me know in the comment section
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