Support Thread

Troubleshooting File Upload Problems in APG vNext v3

File upload issues are among the most common problems reported by APG vNext v3 users. Here are the most frequent causes and solutions.

Permission Denied / Access Error

The upload folder requires write access by the IIS application pool identity:

  • Right-click the uploads folder → Properties → Security tab.
  • Add the application pool identity (e.g., IIS AppPool\YourAppPoolName) with Modify permission.
  • If using IIS 6, grant IUSR_MachineName and IWAM_MachineName write access.

File Too Large Error

There are two separate size limits to check:

  • APG vNext setting: Admin Panel → Settings → Attachments → Max File Size.
  • IIS/ASP.NET limit: Add or modify <httpRuntime maxRequestLength="51200" /> in web.config (value is in KB, so 51200 = 50MB).
  • For IIS 7+, also add: <requestLimits maxAllowedContentLength="52428800" /> (in bytes) inside the <security><requestFiltering> section.

File Type Not Allowed

APG vNext restricts allowed file extensions. To add more types, go to Admin Panel → Settings → Attachments → Allowed Extensions and add the extension (without the dot).

For additional help, post in the Support Forum.

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