diff --git a/packages/apps/src/files/files-accessor.spec.ts b/packages/apps/src/files/files-accessor.spec.ts
index 62832e9de..bb1ab230a 100644
--- a/packages/apps/src/files/files-accessor.spec.ts
+++ b/packages/apps/src/files/files-accessor.spec.ts
@@ -36,7 +36,7 @@ describe('FilesAccessor', () => {
     expect(file.extension).toBe('pdf');
     expect(file.scope).toBe('personal');
     expect(file.source).toBe('botActivity');
-    expect(file.webUrl).toBe('https://contoso.sharepoint.com/report.pdf');
+    expect(file.contentUrl).toBe('https://contoso.sharepoint.com/report.pdf');
     expect(file.raw).toBe(attachment);
   });
 
diff --git a/packages/apps/src/files/files-accessor.ts b/packages/apps/src/files/files-accessor.ts
index f80120ed1..d29c3210b 100644
--- a/packages/apps/src/files/files-accessor.ts
+++ b/packages/apps/src/files/files-accessor.ts
@@ -114,8 +114,8 @@ export class FilesAccessor implements IFilesAccessor {
       extension: content?.fileType,
       scope,
       source: 'botActivity',
-      // Maps the wire's `contentUrl` (a browsable link to the file in OneDrive/SharePoint) to `webUrl`; not fetchable like `downloadUrl`.
-      webUrl: attachment.contentUrl,
+      // Browsable link to the file in OneDrive/SharePoint; not fetchable like `downloadUrl`.
+      contentUrl: attachment.contentUrl,
       raw: attachment,
       downloadUrl,
       httpClient: this.httpClient,
diff --git a/packages/apps/src/files/incoming-file.ts b/packages/apps/src/files/incoming-file.ts
index ba5995ade..a708d95d7 100644
--- a/packages/apps/src/files/incoming-file.ts
+++ b/packages/apps/src/files/incoming-file.ts
@@ -17,7 +17,7 @@ export interface IIncomingFileInit {
   extension?: string;
   scope: ConversationType;
   source: FileSource;
-  webUrl?: string;
+  contentUrl?: string;
   raw?: unknown;
   /** Short-lived, pre-authorized download URL (personal scope). */
   downloadUrl?: string;
@@ -37,7 +37,7 @@ export class IncomingFile implements IIncomingFile {
   readonly extension?: string;
   readonly scope: ConversationType;
   readonly source: FileSource;
-  readonly webUrl?: string;
+  readonly contentUrl?: string;
   readonly raw?: unknown;
 
   private readonly downloadUrl?: string;
@@ -52,7 +52,7 @@ export class IncomingFile implements IIncomingFile {
     this.extension = init.extension;
     this.scope = init.scope;
     this.source = init.source;
-    this.webUrl = init.webUrl;
+    this.contentUrl = init.contentUrl;
     this.raw = init.raw;
     this.downloadUrl = init.downloadUrl;
     this._fetch = init.fetch;
diff --git a/packages/apps/src/files/types.ts b/packages/apps/src/files/types.ts
index 5c00c22cf..62f78429c 100644
--- a/packages/apps/src/files/types.ts
+++ b/packages/apps/src/files/types.ts
@@ -54,8 +54,12 @@ export interface IIncomingFile {
   scope: ConversationType;
   /** Where the SDK found the file. Only `botActivity` is produced today. */
   source: FileSource;
-  /** Web URL to the file in OneDrive/SharePoint when known. */
-  webUrl?: string;
+  /**
+   * Browsable URL to the file in OneDrive/SharePoint, as sent on the attachment's `contentUrl`.
+   *
+   * Not fetchable for bytes despite the name; those come from {@link IIncomingFile.download} or {@link IIncomingFile.stream}.
+   */
+  contentUrl?: string;
   /** The raw underlying attachment/graph object for escape-hatch access. */
   raw?: unknown;