# TraconAttachmentOptions
> Tracon documentation. Tracon is a .NET package family that adds a control
> plane on Microsoft Agent Framework, published as NuGet packages that run
> inside your own ASP.NET Core application.
>
> Page: https://tracon.dev/api/tracon.traconattachmentoptions/
> Summary: TraconAttachmentOptions: Defines attachment upload limits for size and media-type allow lists.
Namespace Tracon · Assembly Tracon.Core.dll
Defines attachment upload limits for size and media-type allow lists.
```csharp
public sealed class TraconAttachmentOptions
```
- Inheritance
- object ← TraconAttachmentOptions
- Inherited Members
- object.GetType(), object.ToString(), object.Equals(object?), object.Equals(object?, object?), object.ReferenceEquals(object?, object?), object.GetHashCode()
## Remarks
Binary content lives in `attachments` and messages carry only a reference.
These options apply only during upload. Type validation reads the content's
leading bytes (its file signature), not the client-supplied `Content-Type`.
## Constructors
### TraconAttachmentOptions\(\)
```csharp
public TraconAttachmentOptions()
```
## Properties
### AllowedMediaTypes
Gets allowed MIME types. A subtype wildcard such as `"audio/*"` is
accepted. Executable content types are deliberately excluded.
```csharp
public ISet AllowedMediaTypes { get; }
```
#### Property Value
[ISet](https://learn.microsoft.com/dotnet/api/system.collections.generic.iset\-1)<[string](https://learn.microsoft.com/dotnet/api/system.string)\>
### MaxBytes
Gets or sets the largest byte count for one attachment. Defaults to 20 MB.
```csharp
public long MaxBytes { get; set; }
```
#### Property Value
[long](https://learn.microsoft.com/dotnet/api/system.int64)