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2026-09-04 08:36:11 +02:00 · 2026-07-23 06:13:40 +00:00
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+# Attachment
+
+> **File:** `src/EchoHub.Core/Models/Attachment.cs`  
+> **Kind:** class
+
+```csharp
+public class Attachment
+```
+
+
+Represents a file attached to a message, such as an image, audio, or document. A message may carry zero or more attachments alongside its text content (Discord-style).
+
+## Remarks
+Decouples attachment data from the message to allow independent storage and retrieval while keeping a lightweight reference to the owning message. The Url provides the relative download path (for example, /api/files/{fileId}) and FileName preserves the original filename. FileSize stores the stored blob size in bytes, which corresponds to ciphertext size when database encryption is enabled. AsciiPreview offers a rendered ASCII-art preview for images in color-tag format and is null for non-image attachments; it is stored encrypted-at-rest and, in end-to-end encrypted channels, remains room-encrypted.
+
+## Notes
+- AsciiPreview is only populated for image attachments; for other kinds of attachments it is null.
+- The Message navigation property may be null if the related Message entity isn't loaded; use MessageId for persistence and rely on Message when the relationship is loaded.