Attachment Control in Power Apps: Implementing File Type Validation

To address a client's requirement for a candidate registration system with restricted file uploads, the author implemented file type validation in Power Apps' attachment control. This ensures that only approved file extensions like JPG, docx, or PDF are allowed, reducing security risks. The approach involves creating a table for candidate registrations, adding data, and implementing a formula in the attachment control's "OnAddFile" property. The formula checks the file extension against the approved extensions and displays an error notification if it doesn't match. The process helps protect the application's integrity and data by ensuring that only specific file types are uploaded.

Article 9m Microsoft Dynamics 365 CRM Tips and Tricks

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