docs: Document enhanced PDF processing capabilities in Slack integration

fern/docs/features/slack-interactions.mdx

@@ -37,7 +37,7 @@ Tag Promptless directly in any channel to trigger documentation updates from ong
 
 <Steps>
   <Step title="Mention Promptless">
-    Tag Promptless bot in a new message or in a thread reply in a channel, along with instructions about how to update the docs, you can add internal and external links, slack links, as well as images. Don't forget to add Promptless bot to the channel if you're tagging it for the first time!
+    Tag Promptless bot in a new message or in a thread reply in a channel, along with instructions about how to update the docs, you can add internal and external links, slack links, as well as images and files. Don't forget to add Promptless bot to the channel if you're tagging it for the first time!
   </Step>
 
   <Step title="Thread Context Analysis">
@@ -73,7 +73,7 @@ Send direct messages to Promptless for private documentation requests or when yo
   </Step>
 
   <Step title="Describe Your Request">
-    Type your documentation request or paste content you'd like to turn into documentation. You can post internal or external links, slack links, images, etc. You don't have to tag Promptless here.
+    Type your documentation request or paste content you'd like to turn into documentation. You can post internal or external links, slack links, images, and other file attachments. You don't have to tag Promptless here.
   </Step>
 
   <Step title="Wait for Promptless DM">

fern/docs/integrations/slack.mdx

@@ -90,6 +90,28 @@ This feature requires additional Slack permissions to access images in threads.
 
 **Note:** Currently, image processing is only supported for images directly shared in Slack threads. Images from other sources (such as changelogs or external links) are not automatically processed.
 
+## Enhanced PDF Processing in Slack Threads
+
+When you share a PDF in a Slack thread and tag @Promptless or use the "Update docs" message action, Promptless will automatically:
+
+<Steps>
+  <Step title="Extract Images from PDFs">
+    Identify and extract images embedded within PDF files. Use these extracted images to enhance the documentation where applicable.
+  </Step>
+
+  <Step title="Preserve Table Structure">
+    Maintain the formatting and structure of tables when converting PDFs to markdown, ensuring complex data presentations remain readable and properly formatted in your documentation.
+  </Step>
+
+  <Step title="Generate High-Quality Markdown">
+    Convert PDF content to clean, well-structured markdown that preserves the information hierarchy of the original document.
+  </Step>
+</Steps>
+
+<Note title="Automatic Processing">
+  PDF processing improvements work automatically with existing Slack workflows. No additional setup or configuration is required beyond your standard Promptless integration.
+</Note>
+
 ## Permission Scope and Usage
 
 ### What Promptless Actually Does