change applied and updated tests

ElementX/Sources/Other/Extensions/String.swift

@@ -6,6 +6,7 @@
 //
 
 import SwiftUI
+import UniformTypeIdentifiers
 
 extension String {
     /// Returns the string as an `AttributedString` with the specified character tinted in a different color.
@@ -107,3 +108,13 @@ extension String {
         return "#\(aliasLocalPart):\(serverName)"
     }
 }
+
+extension String {
+    var validatedFileExtension: String {
+        let fileExtension = (self as NSString).pathExtension
+        guard !fileExtension.isEmpty else {
+            return "bin"
+        }
+        return UTType(filenameExtension: fileExtension) != nil ? fileExtension : "bin"
+    }
+}

ElementX/Sources/Screens/Timeline/View/TimelineItemViews/FileRoomTimelineView.swift

@@ -38,6 +38,14 @@ struct MediaFileRoomTimelineContent: View {
     var shouldBoost = false
     var isAudioFile = false
 
+    private var fileDescription: String {
+        var fileDescription = "\(filename.validatedFileExtension.uppercased())"
+        if let fileSize {
+            fileDescription += " (\(fileSize.formatted(.byteCount(style: .file))))"
+        }
+        return fileDescription
+    }
+
     var onMediaTap: (() -> Void)?
 
     private var icon: KeyPath<CompoundIcons, Image> {
@@ -69,14 +77,13 @@ struct MediaFileRoomTimelineContent: View {
 
     var filePreview: some View {
         Label {
-            HStack(spacing: 4) {
+            VStack(alignment: .leading, spacing: 0) {
                 Text(filename)
-                    .truncationMode(.middle)
-
-                if let fileSize {
-                    Text("(\(fileSize.formatted(.byteCount(style: .file))))")
-                        .layoutPriority(1) // We want the filename to truncate rather than the size.
-                }
+                    .foregroundStyle(.compound.textPrimary)
+                    .font(.compound.bodyLG)
+                Text(fileDescription)
+                    .font(.compound.bodySM)
+                    .foregroundStyle(.compound.textSecondary)
             }
             .font(.compound.bodyLG)
             .foregroundStyle(.compound.textPrimary)