IO-3340 Change application type on PDFs uploaded via imgproxy to allow inline display.

server/media/imgproxy-media.js

@@ -44,11 +44,20 @@ const generateSignedUploadUrls = async (req, res) => {
     for (const filename of filenames) {
       const key = filename;
       const client = new S3Client({ region: InstanceRegion() });
-      const command = new PutObjectCommand({
+      
+      // Check if filename indicates PDF and set content type accordingly
+      const isPdf = filename.toLowerCase().endsWith('.pdf');
+      const commandParams = {
         Bucket: imgproxyDestinationBucket,
         Key: key,
         StorageClass: "INTELLIGENT_TIERING"
-      });
+      };
+      
+      if (isPdf) {
+        commandParams.ContentType = "application/pdf";
+      }
+      
+      const command = new PutObjectCommand(commandParams);
       const presignedUrl = await getSignedUrl(client, command, { expiresIn: 360 });
       signedUrls.push({ filename, presignedUrl, key });
     }