How do I add permissions with no IIS ?

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VB

ASP.NET4

permissions

When I call a specific function, I get the following error. My hosting is with 1&1ionos and I do not have IIS. The function uses Mediatoolkit.dll which is in the BIN folder. Please can anyone tell me what to do to fix this error?

ConvertFile(Server.MapPath("~/videos/example.MOV"), Server.MapPath("~/videos/test.mp4"), Options.VideoSize.Hd720)

Exception Details: System.UnauthorizedAccessException: Access to the path '\MediaToolkit' is denied.

ASP.NET is not authorized to access the requested resource. Consider granting access rights to the resource to the ASP.NET request identity. ASP.NET has a base process identity (typically {MACHINE}\ASPNET on IIS 5 or Network Service on IIS 6 and IIS 7, and the configured application pool identity on IIS 7.5) that is used if the application is not impersonating. If the application is impersonating via <identity impersonate="true"/>, the identity will be the anonymous user (typically IUSR_MACHINENAME) or the authenticated request user.

To grant ASP.NET access to a file, right-click the file in File Explorer, choose "Properties" and select the Security tab. Click "Add" to add the appropriate user or group. Highlight the ASP.NET account, and check the boxes for the desired access.

What I have tried:

I have tried allowing WRITE access to Mediatoolkit.dll and also the VIDEOS folder but no luck. Is it the dll file or VIDEOS folder which requires permissions?