I followed the guide at Configure an S3 compatible object storage provider for uploads to set up Backblaze B2 for upload storage and I’m seeing a strange problem. If I create a thread and upload an image the img src is set to my S3_CDN_URL. If I upload a zip file the URL is at /uploads and redirect directly to my bucket instead of using the S3_CDN_URL. I do not have DISCOURSE_CDN_URL set - the guide indicate it doesn’t affect this issue. Me relevant settings are: DISCOURSE_USE_S3: true DISCOURSE_S3_REGION: "us-west-000" DISCOURSE_S3_INSTALL_CORS_RULE: false DISCOURSE_S3_CONFIGURE_TOMBSTONE_POLICY: false DISCOURSE_S3_ENDPOINT: "https://s3.us-west-000.backblazeb2.com" DISCOURSE_S3_ACCESS_KEY_ID: "ID" DISCOURSE_S3_SECRET_ACCESS_KEY: "KEY" DISCOURSE_S3_CDN_URL: "https://devforum-b2-cdn.freetls.fastly.net" DISCOURSE_S3_BUCKET: "bucket-name" DISCOURSE_S3_BACKUP_BUCKET: "backup-bucket/devforum" DISCOURSE_BACKUP_LOCATION: s3 Why would zip files be handled differently than images?

This storage thing and its configuration is indeed a big challenge for the many years. I was storing my images on Aws S3. And then I changed my storage back to local server. Now there are 100s of images that disappeared suddenly. Though this is not direct reply or comment on your query, I’m just showing empathy towards the similar issues.

Thank you. I’ve assigned the job to some local friend of mine. He is looking into it. Though on your asking I selected this option just now. Use CDN URL for all the files uploaded to s3 instead of only for images. But there seems to be some other problem. He has shifted s3 storage to local server. Now many of my old posts, which if had 10 photos, around half are displaying and other half not. (example of one such topic) He would work on resolving this, coming weekend. Earlier, before asking him, I naively selected the option to have all images included in my backups, then restored that backup thinking that it’d restore the images to local server, thinking that this would be enough to move all my images from s3 to local. But this is not so simple (as I’m finding on many related topics on meta).

[image] Bathinda: Thank you. I’ve assigned the job to some local friend of mine. He is looking into it. Sorry. I was talking about the other issue. Yours, I’m pretty sure, is much more complicated. [image] Bathinda: He has shifted s3 storage to local server. That’s complicated indeed. I think that the missing images on that post are because the Upload record doesn’t exist, so you’ll need to do something to get that image back. I could be wrong. If I’m right, here’s how I solved what I think was a similar problem before. I’m offering no free support beyond this script. def process_uploads begin # Read the list of filenames filenames = File.readlines('/shared/uploads/allfiles.txt').map(&:strip) count = 0 filenames.each do |filename| # Prepend /shared to the filename filename.gsub!(/\.\//,"") full_path = File.join('/shared/uploads/default/original/', filename) begin # Check if path exists and is a regular file (not a directory) count += 1 if File.exist?(full_path) && File.file?(full_path) # Open the file File.open(full_path, 'r') do |tempfile| # Create upload using the specified parameters u = UploadCreator.new(tempfile, 'imported', {}).create_for(-1) puts "#{count} -- #{u.id}: #{u.url}" end else puts "Warning: Path not found or is not a regular file: #{full_path}" end rescue => e puts "Error processing file #{full_path}: #{e.message}" # Continue with next file even if current one fails next end end rescue Errno::ENOENT puts "Error: Could not find files.txt" rescue => e puts "Error reading files.txt: #{e.message}" end end # Execute the processing process_uploads;

Downloads coming from S3 even with DISCOURSE_S3_CDN_URL set

Product Support

pfaffman (Jay Pfaffman) April 23, 2025, 2:01pm 3

See site setting: S3 use CDN URL for all uploads

Use CDN URL for all the files uploaded to s3 instead of only for images.

Topic		Replies	Views
My images are not working Self-hosting uploads , s3	15	1174	April 24, 2023
Set up file and image uploads to S3 Self-Hosting configuring , how-to	35	122364	October 25, 2025
Set up BackBlaze S3 with BunnyCDN Sysadmins how-to	34	7454	April 17, 2025
Providing a more understandable explanation for ‘s3 use cdn url for all uploads‘ setting UX cdn , s3	7	811	October 31, 2023
Configure an S3 compatible object storage provider for uploads Self-Hosting cdn , configuring , how-to , reference	267	54851	September 15, 2026

Downloads coming from S3 even with DISCOURSE_S3_CDN_URL set

Related topics