diff --git a/internal/site/lib/slack-manifest.ts b/internal/site/lib/slack-manifest.ts
index d70be3c..d4e2842 100644
--- a/internal/site/lib/slack-manifest.ts
+++ b/internal/site/lib/slack-manifest.ts
@@ -46,6 +46,7 @@ export function createAgentSlackManifest(appName: string, webhookUrl: string) {
           "groups:history",
           "groups:read",
           "files:read",
+          "files:write",
           "im:history",
           "im:read",
           "im:write",
diff --git a/packages/blink/src/cli/setup-slack-app.ts b/packages/blink/src/cli/setup-slack-app.ts
index 5cb887f..bb918e6 100644
--- a/packages/blink/src/cli/setup-slack-app.ts
+++ b/packages/blink/src/cli/setup-slack-app.ts
@@ -377,6 +377,7 @@ export async function setupSlackApp(
           "groups:history",
           "groups:read",
           "files:read",
+          "files:write",
           "im:history",
           "im:read",
           "im:write",
diff --git a/packages/slack/example-manifest.json b/packages/slack/example-manifest.json
index c0441df..2f20ece 100644
--- a/packages/slack/example-manifest.json
+++ b/packages/slack/example-manifest.json
@@ -61,6 +61,7 @@
         "commands",
         "emoji:read",
         "files:read",
+        "files:write",
         "groups:history",
         "groups:read",
         "im:history",