SharePoint Storage configuration
Enable SharePoint as a storage solution
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Go to your platform home page. 
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Select Settings > Admin Panel > Integrations > Storage Configuration. 
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Select the checkbox next to SharePoint 
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Select Add SharePoint Resource 
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Add the SharePoint domain URL you wish to enable 
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Select Grant permission. 
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Click Save. 

Notes on restrictions
- 200 character limit on URL length
- Site-level URLs only. Microsoft API does not allow direct links to sub-folders or files. The allowed structure is usually https://company.sharepoint.com/sites/site_name
- Links to individual pages are not supported (ending in.aspx)
- Links containing query parameters are not supported
Using the integration
Once enabled the SharePoint option will be visible in the Attachments section of a submission form. The domains you added will be available as sources to select files from.